The invention relates to the field of underground metal mine pillar-free sublevel caving mining, in particular to an experimental facility for detecting a rock mixing rate in ore drawing experimental process of a laboratory. The experimental facility comprises an ore drawing box body, an ore removing device, a separating device and a weighing device which are arranged from top to bottom, and also comprises a display device and a PLC control system; the PLC control system is connected through a circuit and controls the devices, and the rock mixing rate and change of the rock mixing rate are automatically detected in an ore drawing experiment. Ores are removed in a standardized manner by using mechanized ore removal and automated control, so that the influence of human factors on the rock mixing rate is greatly reduced, and the efficiency and accuracy of the ore drawing experiment are greatly improved; the whole ore drawing process is recorded and monitored, related experimental data are collected in real time so that real-time data of the ore drawing process are realized, and experimental phenomena are analyzed and summarized conveniently; and a traditional ore drawing experiment is combined with a sensor technology, an automated control technology and the like, so that automatic detection of the rock mixing rate in the ore drawing experimental process is realized.