The utility model provides an environmental parameter measuring apparatu based on low voltage power line carrier communication belongs to environmental parameter precision measurement technical field. This measuring apparatu includes casing and integrated circuit, and integrated circuit is inside the casing, and integrated circuit passes through the line connection power. The casing front end has the regional and pilot lamp region in inlet scoop, and there is the regional and power source region of air outlet the rear end, and integrated circuit is become by microprocessor, environmental parameter collection module, carrier communication module, data storage module, power module and isolation protective film block group. The utility model discloses have DCDC and keep apart power module and low voltage power line carrier communication module, keep apart the chip through the numeral and keep apart carrier communication and microprocessor, can keep apart the power line totally and to the electromagnetic interference of measuring apparatu, realize that the accurate of environmental parameter detects, measurement accuracy height, good reliability.