Siphon type automatic drainage device

The utility model discloses a siphoning type automatic drainage device which comprises a water collecting container and a drainage pipe and further comprises a water inlet pipe, the surface of the top end of the water inlet pipe is in threaded connection with a fastening cover, the bottom end of the water inlet pipe is fixedly connected with a first three-way valve, and a left water opening of the first three-way valve is fixedly connected with an L-shaped pipe. A water outlet of the second three-way valve is fixedly connected with an N-shaped pipe, the end, away from the second three-way valve, of the N-shaped pipe penetrates through the water collection container and extends to the lower position in the water collection container, and an electromagnetic valve is fixedly connected into the water drainage pipe. According to the siphoning type automatic drainage device, drainage of the water collecting container is achieved through the siphoning principle, the structure is simple, the overall device occupies s