The single / multi-channel optical power meter has a built-in large-sensitive photoelectric detector and a high-precision photoelectric detection unit, which achieves an optical power measurement accuracy better than 0.2dB in a 7OdB dynamic range. It can realize automatic acquisition of optical power in multiple channels with a host computer control software. The device can collect temperature at the same time when select the temperature acquisition module, which is convenient for the automatic test system of optical devices.