The obstacle avoidance radar module is used to measure the relative distance between the UAV and the obstacle in front to effectively avoid the obstacle. Obstacle avoidance radar adopts 24GHZ radar technology and works in environments such as strong light, high temperature, fog, dust, wind and night. It has the characteristics of high sensitivity, long detection distance and fast and stable signal transmission. It can detect 1cm or more diagonal cables, 10cm small tree trunks, 1.7m tall people and 15cm poles. It is well suited to operate in complex environments such as fast-flying UAVs and crop spraying drones with excellent obstacle avoidance.