Technical content: A pipe pump with self-priming function is characterized by: including motor, flange parts, pump body and control device. The motor is fixed connected with pump body through flange parts. The pump body includes pump shell and pump cover. The pump shell is equipped with water inlet and outlet, and a leaf is formed between pump cover and pump shell. The impeller chamber is equipped with impeller components in the impeller chamber. The impeller components include the inlet impeller, the outlet impeller and the baffle. Both the inlet impeller and the outlet impeller are centrifugal impellers. The baffle separates the impeller chamber into the inlet and outlet passages. The inlet impeller is in the inlet passage, and the outlet impeller is in the outlet passage. A water tank is formed between the pump shell and the flange parts. The water tank is provided with a water injection nozzle, and the water injection nozzle is screwed with a plug. The center of the water tank extends upward to form a water pipe. The top of the water pipe has an inlet, the inlet and the water outlet are connected, and the water tank is connected with the water outlet. A water passage is provided with a water passage, the water passage is located at the bottom of the side wall of the water tank; a backflow hole is formed between the water tank and the water inlet, and a check valve is arranged in the backflow hole; the water passage and the backflow hole are at the lowest position of the water tank.