Energy metering device and method

The invention provides an energy metering device and method and relates to the technical field of electric energy monitoring. The energy metering device comprises an acquisition device which is connected with a tested power supply and collects a current value and a voltage value of a tested circuit, a main chip which is in signal connection with the acquisition device and converts data acquired bythe acquisition device into a digital signal code, determines a metering mode for energy metering according to the digital signal code according to the number of zero crossing points of the digital signal code, and performs energy metering, wherein the metering mode comprises alternating current metering and direct current metering. The energy metering device can convert the collected data into adigital signal, determines whether the power supply is direct current or alternating current and further select a corresponding energy metering mode, so that the metering mode can be switched in realtime under the condition o