The relay control box is an extremely important electronic component in the aircraft system, and it is the basic component for the automatic control of the aircraft. Its quality is an important guarantee for the safe flight of the aircraft. The relay box needs to switch on and off the circuit frequently. This feature makes it one of the most vulnerable parts of a helicopter. This paper designs a universal and fast relay control box testing equipment. Through the upper computer to input the connection relationship of the internal relays of different types of relay control boxes, the complicated circuits in the relay box can be detected. It greatly improves the efficiency of the inspection of aircraft relay boxes, improves the accuracy of the inspection, and plays an important role in ensuring the quality of the relay boxes.