Three-in-one electricity metering device

The utility model discloses a three-in-one electricity metering device, which comprises a CPU (central processing unit). A communication interface module, a GPRS (general packet radio service) module, a metering chip, a switch input and output interface module, a display module, a press key and a memory are connected to the CPU. A RS232 (recommend standard 232) module, an infrared receiving and transmitting module, a RS 485 module and a carrier module are connected to the communication interface module. A current and voltage sampling module is connected to the metering chip, and the carrier module and the current and voltage sampling module are both connected with a power supply. By means of the three-in-one electricity metering device, repeated construction, resource wasting and compatible difficulty can be avoided, and the problems of poor stability and low efficiency in the prior art in terms of terminal detection are resolved.