The invention discloses an antifreezing water-quality monitoring device which comprises a singlechip microcomputer, and further comprises a power resistor, a water inlet valve and a water outlet valve, wherein the singlechip microcomputer is simultaneously connected with a temperature sensor, a wireless data transmission DTU (Data Terminal Unit) and a water quality transmitter; the water inlet valve is arranged on a water inlet pipe; the water outlet valve is arranged on a water outlet pipe; the power resistor is connected with the singlechip microcomputer through a first relay; the water inlet valve and the water outlet valve are respectively connected with the singlechip microcomputer through a second relay and a third relay. According to the antifreezing water-quality monitoring device disclosed by the invention, due to the arrangement of the power resistor, the water inlet valve and the water outlet valve, normal use under the low-temperature environment is realized, and the accuracy and the stability of data acquisition are guaranteed. The antifreezing water-quality monitoring device has the advantages that water resources are saved, the service life is prolonged and the like.