Laser power meter is widely used in measuring the power of continuous laser and average power of pulsed laser. Fast and accurate measurement of laser power is of great significance in scientific research and industrial development. In this paper, the working principle of various laser power meters is introduced systematically. The advantages and disadvantages of various measurement methods, and the wavelength, measurement range and uncertainty of power measurement, are analyzed. The laser power measurement method based on photodynamics and its development potential are discussed. Furthermore, the future development and application of laser power measurement are prospected.