Semiconductor automatic constant temperature device

The invention discloses a semiconductor automatic constant temperature device comprising a vehicle mounted GPS monitoring terminal (1), a semiconductor refrigeration plate (2), and a metal radiator (3); the vehicle mounted GPS monitoring terminal (1) and the metal radiator (3) are respectively attached to the cold end and the hot end of the semiconductor refrigeration plate (2); a miniature temperature control switch A (4) for high temperature control, a miniature temperature control switch B (5) for low temperature control, and a miniature relay (6) used for converting voltage directions arearranged in the vehicle mounted GPS monitoring terminal (1); the miniature temperature control switch A (4), the miniature temperature control switch B (5) and the miniature relay (6) are respectivelyelectrically connected with the semiconductor refrigeration plate (2). The vehicle mounted GPS monitoring terminal semiconductor automatic constant temperature device can solve the problems that theGPS monitoring terminal can