Automatic heating system of seat

The utility model discloses an automatic heating system of a seat. The automatic heating system of the seat comprises a controlling unit, a seat bearing sensor, a heating device, a vehicle exterior temperature sensor, a vehicle interior temperature sensor, a seat temperature sensor and a timer. The controlling unit is connected with the seat bearing sensor, the heating device, the vehicle exterior temperature sensor, the vehicle interior temperature sensor, the seat temperature sensor and the timer. The automatic heating system of the seat can automatically heat the seat through a pressure signal transmitted by the seat bearing sensor to a level that brings comfort to passengers according to temperature outside and inside a vehicle. Meanwhile, when the human body leaves the seat, the automatic heating system can be automatically closed. The automatic heating system of the seat is simple in structure and low in price.