Organic-inorganic hybrid perovskite light-emitting diodes (PeLEDs) is a new type of light-emitting device, it have many advantages, including a wide range of raw material sources, simple device preparation, and high carrier mobility, making it one of the research hotspot in the field of displays and luminescence. Despite this, PeLEDs do have disadvantages, such as poor luminescence stability and small, uniform luminous areas, and there is no unified measurement method for testing PeLED quantum efficiency. In light of this, we propose a new type of PeLED quantum conversion efficiency measurement system. Using a small-sized integrating sphere combined with a spectrum measurement system to collect the PeLED light emission, the quantum conversion efficiency is determined. Standard GaN light-emitting diode data is used to calibrate the center wavelength, brightness, and radiance of the system. Finally, this system is used to measure the performance of actual PeLED devices. Experimental results show that the PeLED external quantum efficiency is the highest (0.089%) at a voltage of 3.2V, and the error determined from the reference did not exceed 6%.