To investigate the effects of plastic film mulching (PM) of ratoon rice on CH₄ emissions, CH₄ fluxes from ratoon paddy fields under PM in the hilly area of central Sichuan in 2016 and 2017 were observed by static chamber-gas chromatography. The experiment was conducted with two treatments:film mulching single rice (SR) and film mulching ratoon rice (SR-RR). The results showed that the peak of CH₄ emissions appeared earlier in the main crop season in the SR-RR treatment, and CH₄ emissions in the ratoon season was lower, accounting for approximately 8%-10% of the total amount in the two seasons. The total CH₄ emissions of the SR-RR treatment in the two seasons was 103-306 kg/hm² during the full observation period, which was 11%-16% higher than that of the SR treatment (P > 0.05). The total yield of the SR-RR treatment during the two rice seasons was 10.2-10.4 t/hm², which was 19%-22% (P < 0.05) higher than that of the SR treatment. The CH₄ emissions per unit of yield from the SR-RR treatment was 9.9 to 30.1 kgCH₄/t grain, which was 6% lower than that of the SR treatment (P < 0.05). Planting ratoon rice under PM can ensure high and stable yield of rice and reduce CH₄ emissions per unit of yield, which is worth popularizing.