Abstract: Aiming at the high moisture content of livestock and poultry manure compost which is easy to block and difficult to disperse, the labor intensity of artificial spreading is large, which seriously restricts the effective utilization of livestock and poultry manure. The physical characteristics such as moisture content, bulk density, sliding friction angle, and natural angle of repose were statistically analyzed, and the hydraulic system of the whole machine was designed based on this, and the auxiliary control system integrated with the flexible throwing mechanism, the variable length stirring plate mechanism, the Arduino control module and the Beidou navigation was innovatively designed. Choose the spraying speed, walking speed and spraying angle as the test factors, and use the coefficient of variation of uniformity and the spreading width as the test indicators for orthogonal test and response surface analysis. The results showed that the influence of the spraying speed, the spraying angle, and the walking speed on the coefficient of variation of the spreading uniformity decreases in turn. The design-Expert 12.0.3.0 software was used for response surface analysis. When the spraying speed was 305 r/min, the walking speed was 4 km/h, when the spreading angle was 20°, the uniformity variation coefficient was 26.8%, and the spreading width was 5.2 m. At this time, the spreading width meets the design requirements and the coefficient of variation is the smallest, which is verified by experiments.