An electro-mechanical gyro-balanced unicycle includes a wheel provided with a first motor, a housing provided outside the wheel and hollow pedals respectively provided at both sides of the housing. The pedal is provided with an electro-mechanical gyro assembly, and the electro-mechanical gyro assembly includes a second motor and a rotor capable of being driven by the second motor to rotate at a high speed so as to produce torques in a horizontal plane. The unicycle has a simple structure, can enable a beginner to be capable of quickly getting on the unicycle without any external assistant force, and can still well realize self-balance in left and right directions over time.