The invention discloses an automatic early warning power supply device, which comprises a housing. The top end of the housing is equipped with a top cover; the upper portion at one side of the top surface of the top cover is provided with a temperature alarm; the lower side of the temperature alarm is equipped with a temperature warning lamp; the upper portion at the other side of the top surface of the top cover is provided with an arc alarm; the lower side of the arc alarm is provided with an arc alarm lamp; the position, close to the front surface, in the middle of the top surface of the top cover is provided with an emergency power-off button; the emergency power-off button is associated with an emergency power-off switch; the other end of the emergency power-off switch is connected with a solar energy power supply source; the solar energy power supply source is arranged in the housing; the other end of the solar energy power supply source is in circuit connection with a surge protection device; the other end of the surge protection device is in circuit connection with a double-control relay switch a; and the solar energy power supply source is associated with an arc sensing relay and a temperature sensing relay. The automatic early warning power supply device can carry out temperature and arc early warning on a domestic solar energy power supply source, and can take emergency measures for a part of circuit break.