Water heater pipeline drainage structure

Disclosed is a water heater pipeline drainage structure. A connecting pipe is arranged between a water heater and a faucet. The water heater pipeline drainage structure is characterized in that an air inlet drainage device (A) is arranged between the upper end of the connecting pipe and the water heater, an air inlet drainage device (B) is arranged between the lower end of the connecting pipe and the faucet, and each air inlet drainage device comprises a body, a hole sealing body, an elastic body and a diversion body, wherein a water inlet connector, a water outlet connector, a hole sealing body cavity, a positioning portion, an air inlet drainage opening and an air inlet drainage channel are arranged on the body. When the faucet is closed, the elastic body ensures that the hole sealing body is deviated from the air inlet drainage opening; the hole sealing body abuts against the diversion body; the head of the diversion body abuts against the concave inner bottom of the hole sealing body; the air inlet draina