The invention relates to a system and method for measuring direct voltage based on wireless transmission, with the system comprising: a direct voltage measuring equipment, which is based on direct voltage, measuring voltage on high-precision low-voltage resistance collected by A/D sampling unit in probe and transmit voltage data through wireless transmission unit; a personal computer, which applies a built-in wireless receiver to receive the transmitted voltage data and obtains the direct voltage of object to be measure through calculating resistance ratio of high-voltage resistance and low-voltage resistance. The direct voltage measuring equipment is characterized by low-voltage floating ground measurement, and being able to measure direct voltage using multiple measuring equipments at the same time.