Automatic tire pressure measuring and inflating device

Provided is an automatic tire pressure measuring and inflating device. A pressure sensor is used for monitoring tire pressure in real time and transmitting data to a main control unit, the main control unit is used for judging the situation of the tire pressure, when the tire pressure is lower than a preset pressure value range, an instruction is sent to an inflating switch, the inflating switch enables an inflating pump to be opened and inflate a tire, and reinflation can be performed in time when the tire pressure is not enough. When the tire pressure is higher than values in the range, the main control unit sends out an instruction, the inflating switch enables the inflating pump to be closed, inflation is stopped, meanwhile, an indicator installed in a compartment is electrically connected with the main control unit and can display the tire pressure at any time, and therefore a driver can master the situation of the tire pressure well. The automatic tire pressure measuring and inflating device reduces possibility of accidents caused by insufficient tire pressure of an automobile and improves safety of the automobile.