Abstract: The present disclosure provides a tandem rotor unmanned aerial vehicle, which includes a vehicle body, a flight control system, and a propulsion system. The propulsion system includes a front distributed propulsion system and a rear distributed propulsion system. The front distributed propulsion system is arranged at a front end of the vehicle body. The rear distributed propulsion system is arranged a rear end of the vehicle body. The front distributed propulsion system includes rotor blades, a rotor nose, a main shaft, a speed reducer, a synchronizer, a motor, and a periodic variable pitch mechanism. A polar attitude of the tandem rotor unmanned aerial vehicle of the present disclosure can be adjusted conveniently and stably in the air, and the adjustment efficiency is high. The present disclosure further provides an attitude adjustment control method for the tandem rotor unmanned aerial vehicle.