A coaxial output motor, including a motor subassembly, a transmission mechanism, and a gear shift mechanism. The motor subassembly includes a motor housing, a rear cover disposed on one end of the motor housing, a front cover disposed on another end of the motor housing, and a rotor shaft movably disposed on the rear cover and the front cover. The rotor shaft is a hollow structure. The transmission mechanism includes an input gear fixedly disposed on a front end of the rotor shaft and a first countershaft gear movably disposed on the front cover. The gear shift mechanism includes a first speed change gear. The first speed change gear is movably disposed on the tip of the front end of the rotor shaft. The input gear is connected to the first speed change gear via the first countershaft gear.