Snows alarming and automatic salt spreading device

The invention discloses a snows alarming and automatic salt spreading device. The device consists of a snows collecting device and an automatic salt spreading device which are separately arranged, the snows collecting device is composed of an infrared alarm and a snows box, and the automatic salt spreading device comprises a salt storing and rotating part, a servo motor, a servo motor controller and a fixed box; the snows alarm at certain thickness can be realized by the snows collecting device, the automatic salt spreading device can automatically start the salt spreading device after an alarm signal is received so as to realize an effect of spreading a salt spreading block snow-melting agent, therefore the hazard of crushing the roof by heavy snow can be effectively prevented; furthermore, the snows alarming and automatic salt spreading device can alert people at the night with sudden snowfall, and provide a guarantee for the safety of people.