Abstract: The processing tomato variety ‘KF1501’ was used as the experimental material, and a random block design was adopted.Two liquid mulching films with different components were set up, namely A and B,and plastic mulching film was used as the control.The difference of soil moisture and heat under drip irrigation was studied, in order to determine the effect of liquid mulch on the yield and quality of processing tomato.The results showed that the average temperature of each soil layer covered with liquid film was significantly lower than that of the control, the average temperature of A and B treatments was 1.6%-2.3% and 2.6%-4.0% lower than that of the control respectively, and there was no significant difference in the accumulated temperature among the treatments.The soil moisture content of 0-30 cm layer treated with liquid film was significantly higher than that of the control, and there was no significant difference between the treatments below 30 cm.The soil moisture content of A and B treatments in 0-30 cm layer was increased by 30.4%-53.3% and 34.3%-64.6% respectively.The yield of liquid film treatment was significantly higher than that of control, treatment B and A increased by 20.8% and 12.4%,respectively.Compared with the control, the liquid film treatment had no significant effect on the processing quality such as soluble solid content, lycopene and color difference.Therefore, the liquid film mulching can meet the needs of water and heat for the growth of processing tomato, which has the effect of increasing yield, but had no significant effect on quality.With the amount of mother liquor increased, the output also increased.