Monitoring device for preventing backflow of water pump

The invention discloses a monitoring device for preventing backflow of a water pump. The device comprises a screw (1), wherein an inner screw hole is formed in the center of the screw (1) in the length direction; a probe protective sleeve (2) is rotatably arranged at the bottom of the inner screw hole of the screw (1); the probe protective sleeve (2) is a barrel-shaped structure; the opening end of the probe protective sleeve (2) with the barrel-shaped structure faces the inner screw hole of the screw (1); a magnetic conductive piece (3) is arranged at the bottom of the barrel-shaped opening of the probe protective sleeve (2); a sensor (4) is mounted on the magnetic conductive piece (3); a waveform input module (5) is embedded inside the probe protective sleeve (2); and after passing through the waveform input module (5), the sensor (4) outputs a signal outwards through a signal line (6). According to the monitoring device for preventing backflow of the water pump, reverse rotation of a pump body can be monit