The invention discloses a dynamic environment monitor system which comprises a temperature and humidity module, an alternating current voltage detection module, a telephone dialing module, a voice alarm module, a microprocessor and a telephone line power supply module, wherein the temperature and humidity module is used for detecting the temperature and the humidity of the external environment; the alternating current voltage detection module is used for detecting on-off of the commercial power; the telephone dialing module is used for dialing a telephone number of a preset user; the voice alarm module is used for sending voice alarm information to the preset user; the microprocessor is used for judging whether detection results of the alternating current voltage detection module and the temperature and humidity module exceed a preset range or not, thereby whether the telephone dialing module and the voice alarm module are started or not is selected; and the power supply module is used for communicating with a telephone line, thereby power supply is realized. The power is supplied to the dynamic environment monitor system through the telephone line, thereby a power transformer anda backup battery are saved, the cost and the energy is saved, the environmental is protected, and the realized telephone voice alarm also has the advantages of stronger effectiveness.