Abstract: Abstract: This paper describes the design of a wireless multi-point soil resistivity measurement system. The system is composed of many slaves and a host. According to "the principle of current - voltage four terminal methods," this paper presents a sensor made in our laborator. It included an A/D conversion chip MCU, wireless communication circuit, the sine wave generating circuit, AC constant current source circuit, sensor electrode, differential circuit, conversion circuit, amplifier circuit, and digital potentiometer effective value. It can reduce the interference of soil solute movement. The system was established by measuring a platform of master-slave communication. The slave completes the soil resistivity data acquisition and transmission. A number of slaves can be extended according to the requirements of the measuring point. The host comprised a single chip computer, a liquid crystal display circuit, external data storage circuit, wireless communication circuit. And the key circuit completes the soil resistivity data receiving, processing, display, and storage function. Wireless communication circuit adopts nRF24L01 wireless module, and can constitute a "one-to-many" communication network. In order to stabilize amplitude alternating test design of the constant current source, the simulation test of soil impedance changes using a variable resistance, used for the test of stability constant current source, the relative error of the elongation is 2.63%, and it has good stability. Outdoor wireless transmission distance can reach 95m, indoor reached 75m. The system effectively solves the multi-point soil resistivity measurement consistency problem. There was a good linear relationship between salt content of soil and soil resistivity measured systematically, the higher is the salinity, the smaller is the soil resistivity measured. There was a good linear relationship between the soil resistivity measured systematically and the amount of water, the larger is the add water amount, the smaller is soil resistivity measured. The design of the system is novel, is simple to operate, with good portability, and soil resistivity data to detect intelligent automated multiple locations can be moved at any time. At the same time, the construction is convenient, has a broad application .prospect in production, and can be widely popularized.