In agricultural landscapes, the survival and reproduction of pollinators depends on the size of semi-natural habitats. The intensive agricultural production model has caused a decrease in semi-natural habitats and an increase in the proportion of land dedicated to agriculture. This study aimed to quantify any changes in the diversity of pollinators following this increase in the proportion of land dedicated to agriculture. Our study area was in Gongyi City, which is a typical agricultural region located near the lower reaches of the Yellow River. Twenty-one study sites were collected from the northeast to the central area. Pan traps were used to capture pollinators from farmland and woodland habitats. Using the Akaike Information Criterion (AIC), we calculated the optional characteristics scales of the pollinators and landscape features by 500m, where landscape simplifying was determined in terms of farmland proportion. Finally, the proportion of farmland was chosen as the basis of landscape simplification, which provided us with 21 sample points as the simplified gradient of the landscape (the ratio of farmland should be between 5% and 86%). We then explored the impact of landscape simplification on pollinator diversity, which was based on the species abundance and richness of pollinators at each sample point. We caught a total of 39660 individual pollinators. The most common orders caught included Diptera (26236 individuals), Hymenoptera (13893 individuals), and Coleoptera (2033 individuals). Stepwise analysis and linear fitting showed that landscape simplification directly influenced the richness and abundance of pollinators, with greater proportions of farmland significantly negatively correlating with the richness and abundance of species caught (P<0.05). The effect of landscape simplification on different pollinator groups was variable. The effect of landscape simplification was most significant on Coleoptera (R²=0.27), followed by Hymenoptera (R²=0.14), and Diptera (R²=0.11). Landscape simplification was correlated with an increase in the number of Lepidoptera individuals caught (R²=0.09). Hymenoptera abundance was significantly decreased in farmland habitats, while there was no observable change in Hymenopteran abundance in woodlands. Overall, as the proportion of farmland increased, we observed significant changes in the abundance and richness of species caught. Our results showed that the proportion of farmland directly affected the abundance and richness of pollinators caught. In certain areas the balance between farmlands and semi-natural habitats is inappropriate and needs to be carefully reconsidered by decision makers and stakeholders. During land use planning, there should be an emphasis on the habitat and food resources needed by the Coleoptera taxa of pollinating insects in particular. Our results also suggested that more attention needed to be paid to the protection of existing natural vegetation communities in woodland habitats, while nectar-producing plants could be planted in artificial forests. Moreover, linear landscape plants could be planted as a food source for pollinators alongside farmlands. To protect natural habitats, such as weed communities, linear artificial landscapes of a suitable size could be planted on the boundary of farmlands, which would have a significant ecological impact and help to protect resource insects, such as Hymenopterans.