Abstract: The precision spraying technology is an intelligent solution for plant protection operation in the field. However, the field-tests of the precision spraying actuator and its controller is time-consuming, laborious, and reproducible,and many parameters cannot be adjusted, and data acquisition is difficult. In view of this problem, according to the technical requirements for field plant protection and the performance parameters of boom sprayer, through the design and calculation of the liquid circulation system and spray testing system, a precision spray test bench was built. The test platform consisted of a spray testing system, a liquid circulation system, and speed simulator. The test bench can realize real-time sensing and control of liquid medicine flow and pressure, independent control of spray bar section, online simulation and matching of operation speed and liquid medicine flow. The consistency of the spray rate of each section of the spray bar under different pressures, and the control accuracy test of the test bench under different spray volume and simulation speeds were carried out, the results showed that the maximum pressure and flow rate of the precision spray test bench power system were 1. 5MPa and 65L/min respectively, the maximum error of the precision spray was 1. 34 percent, and the coefficient of variation was up to 0. 05, which can meet the precision spray system. It can provide theoretical basis and technical support for the research of intelligent variable operation, and the design and optimization of precision spraying system for boom sprayer.