The invention provides an electric monocycle which is provided with a frame, a main wheel, a
pressure sensor, a
gyroscope and a
central processing unit. The electric monocycle is characterized in that a
speedometer and two sets of balancing devices are further included, and the
speedometer is connected with the main wheel and the
central processing unit and used for detecting monocycle speed information and transmitting the monocycle speed information to the
central processing unit; the balancing devices are symmetrically arranged on the two sides of the frame, and comprise telescopic components and auxiliary wheels, the telescopic components are connected with the central
processing unit and can be lengthened or shortened, the auxiliary wheels are connected with one ends of the telescopic components, and when the central
processing unit judges that the monocycle speed is larger than a high monocycle speed threshold value, the central
processing unit sends a shortening instruction to the telescopic components, the telescopic components are shortened to the minimum according to the shortening instruction, and the auxiliary wheels are made to be away from the ground; when the central processing unit judges that the monocycle speed is smaller than a low monocycle speed threshold value, the central processing unit sends a lengthening instruction to the telescopic components, the telescopic components are lengthened, and the auxiliary wheels and the main wheel are on the ground. According to the technical scheme, the electric monocycle is high safety performance, high in adaptability to road conditions, not likely to fall off and suitable for being used by various people.