An embodiment of the invention relates to a tap water detection device. The tap water detection device comprises a device casing, a micro water-current power generation device, a water quality detection module and a display screen, wherein a detection module mounting hole is formed in the side wall of the device casing, and a connector structure is arranged at one end of the device casing and connected with a tap water pipeline; the micro water-current power generation device is arranged in the device casing and comprises blades, a power generator and a controller, tap water currents drive the blades to rotate to drive a shaft of the power generator to rotate to generate electric current, the electric current is output, direct-current signals are output after rectification by the controller, and a storage battery is charged through the direct-current signals; the water quality detection module is mounted in the detection module mounting hole, is powered up by the storage battery and comprises multiple water quality detection sensors and a circuit board, the multiple water quality detection sensors are used for detecting tap water flowing into the device casing and generating multiple detection signals, and a processing chip is arranged on the circuit board and used for processing the multiple detection signals and generating detection information; the display screen receives the detection information and displays the detection information comprising parameter data of multiple water quality parameters.