A method for restraining the methane discharge at a living garbage landfill field by using methyl chloride relates to a method which can stop the generation of the methane gas in the process of the anaerobic digestion of living garbage. Firstly, the methyl chloride of technical grade sold in the market is used as a depressor for the methane generating flora of the living garbage; then, each ton of living garbage is added with 5 to 25g of the methyl chloride and the water containing rate of the living garbage is 50 to 80 percent; then the methyl chloride is uniformly sprayed in the living garbage during the normal operation of the landfill field; finally, a measurement on the volatilization acid of the percolate of the living garbage is carried out; simultaneously the gas is collected by using a method of discharging the saturated salt water; a gas chromatography is used for detecting each component and content in the gas; the total capacity of the volatilization acid is 0.94 to 1.18g/kg; the ratio of monoprop to acetic acid is 0.73 to 1.24; the methane restraining effect can reach 100 percent. The invention has the low cost and the simple operation, which avoids the greenhouse effect caused by releasing the methane; and carries out control on the metabolizing of acid generating flora simultaneously when restraining the methane, which promotes the stabilization course of the landfill field.