In order to meet the demand of multi-rotor UAV for short-distance loading heavy loads, an electric UAV automatic loading weight scheme is proposed. According to the flight principle of the UAV, the problems existing in the current unloading scheme of the UAV are analyzed, and the performance of the UAV is evaluated from the usability, reliability, maintainability, endurance, and load bearing capacity. The gripper with STM32 chip is used, combined with the modeling calculation, obtains the mounting scheme through the design of the multi-rotor aircraft and the mount control system, and verifies it through the gripping experiment. The test results show that the scheme is feasible and can basically meet the requirements of majority load transportation plans.