The invention relates to an ammeter device with a power line communication modem function. The ammeter device includes a voltage measurement circuit, a current measurement circuit and a display circuit, wherein the voltage measurement circuit, the current measurement circuit and the display circuit are connected with an ECU, and is characterized in that the ECU is also connected with a power line carrier communication circuit and an RJ45 communication circuit; and the power line carrier communication circuit is coupled with a leading-out terminal of the ammeter. The ammeter device with a power line communication modem function can realize coupling of a carrier wave and a power line, and has a router function through integration, so that the ammeter device can solve the problem that the conventional power line carrier technology cannot cross the ammeter to realize data transmission, and can also serve as a terminal so as to realize acquisition of ammeter data through a service provider.