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In order to solve the problems such as low precision of aircraft landing attitude balance control and large range error, the landing attitude balance control system of fixed wing unmanned aerial vehicle for combat is designed. Using CMOS analog multiplexer ADG508 single chip, the hardware of the system power supply circuit, AD conversion circuit, signal acquisition circuit, clock reset circuit, memory expansion circuit and interface circuit debugging and optimization, through the measurement of UAV landing posture, complete the design of system software, combined with hardware and software, design and implementation of combat landing posture balance control the system with fixed wing uav. The experimental results show that the improved system has high control precision, fast return to steady attitude, fast measurement error and small height measurement error, which can fully meet the requirements of attitude measurement.