The invention discloses a multi-channel alternating-current digital power meter which comprises a metering module, a power supply module, a main control module, a communication module and a man-machine interaction module. Circuits to be measured are connected with the power supply module and the metering module respectively, the power supply module is respectively connected with the metering module, the main control module, the communication module and the man-machine interaction module, the metering module comprises twelve voltage and current acquisition units and four metering chips, the twelve voltage and current acquisition units acquire voltage and current signals of twelve circuits to be measured, and an input end of each metering chip is respectively connected with output ends of three voltage and current acquisition units. The power meter overcomes the shortcoming of equinoctial metering of an existing multi-channel power meter, and measuring accuracy is greatly improved, reaches 0.1S under the active power condition and reaches 0.2S under the reactive power condition.