The invention discloses a protection device for an unmanned aerial vehicle during crash. A device body is fixedly connected with bases through connecting rods, and damping devices are arranged in thebases. Safety air bags are arranged on the periphery of the side face of the device body correspondingly, and an acceleration sensor is arranged on one side of the device body. A balancing device is arranged on the lower portion of the device body and comprises a balancing rod, and a balancing ball is arranged at the lower end of the balancing rod. A connecting hole is formed in the upper end of the balancing rod, and a microprocessor and a GPS positioner are sequentially arranged on the upper portion of the device body. The acceleration sensor is electrically connected with the safety air bags through the microprocessor. According to the protection device, design is scientific and reasonable, the structure is simple, the good protection effect can be achieved on the unmanned aerial vehicle during crash, meanwhile, the landing path of the unmanned aerial vehicle can be sensed, the intelligent degree is high, the economic cost is low, the practicability is high, and the protection device is worthy of being popularized on a large scale.