Abstract: At present, residue film recovery machine has become one of the main ways of residue film recovery in xinjiang cotton field. In the process of recovering residual film by residual film recovery machine, due to the complex and changeable environment of cotton field, and the existing residual film recovery machine does not have the function of copying, resulting in the instability of the soil depth of the buried parts, which causes the problems that the residue film clean rate can not reach the expected results and so on. In order to solve this problem, a set of automatic profiling system with mechanical-electro-hydraulic coordination for the 4JSM-2.1A cotton straw returning and residual film recovery combined operation machine was designed to analyze the motion of profiling sensing mechanism on the ground, and determine the key parameters of mechanical components. Finally, the evaluation of the site test and the field test of the copying system showed that the whole machine worked stably and reliably. When the working speed of the machine was 6.5-7 km/h, the average depth of the buried parts was 91.6 mm, and the standard deviation was 3.13 mm. The cleaning rate of residual film reached 89.5%.