Heat-preservation-free pipeline water circulation system

According to the main technical scheme, a water inlet, a water return opening, a first water outlet and a first water level anti-overflow opening are formed in a water tank, and a water level detection device is arranged in the water tank; the water inlet pipeline comprises a first water inlet pipeline connected with the water inlet and a first fluid control device respectively connected with the first water inlet pipeline and the water source pipeline; the water return pipeline comprises a first water return pipeline connected with the water return port, a second fluid control device connected with the first water return pipeline and a second water return pipeline connected with the second fluid control device and the first water supply pipeline; the first water outlet pipeline is respectively connected with the first water outlet and the first water supply pipeline; the first water level anti-overflow pipeline is connected with the first water level anti-overflow opening; the control device comprises a PLC