The accurate measurement of the temporal-spatial distribution of laser intensity is crucial for analyzing the atmospheric propagation effect of high-power lasers and evaluating the beam control and aiming ability of high-power laser systems. Currently, the most reliable method for measuring high-energy laser power intensity distribution is the photoelectric array detection method, offering high temporal-spatial resolution, response sensitivity, and low measurement error. A photoelectric detection unit comprises a laser attenuation sampling apparatus, cooling system, integrating sphere attenuator, optical fiber attenuator, photoelectric detection module, and data processing terminal. Utilizing the photoelectric array detector based on this unit enables the measurement of large area laser spot, high-energy laser, and high temporal-spatial resolution, providing essential technical support for the development of high-power laser photoelectric array detectors.