An automatic tire pressure balancing device is composed of a three-position three-way solenoid valve, a tire valve opening, an exhaust valve opening, an inflation valve opening, a tire, an air cylinder inflation valve, an air cylinder cavity, a rim, a tire inflation valve, a movable iron core, a pressure sensor, a speed sensor, a control panel, an electric wire, a data output module, a wireless transmission module, a battery, an information collecting module and an ECU micro-processing module. The three-position three-way solenoid valve is connected with the rim with an air storage function through a thread, and the control panel carries out intelligent processing according to tire pressure information fed back by the pressure sensor and vehicle speed information fed back by the speed sensor, the communicating state of the three-position three-way solenoid valve is controlled, and then the tire pressure of the tire is adjusted. The automatic tire pressure balancing device has the advantages of being simple in structure and automatically adjusting the tire pressure, and has very high use value.