The utility model discloses a numerical control machine tool electrical cabinet reliability testing apparatus with an environment loading function. The apparatus is composed of an electrical cabinet detection mechanism, a bearing vehicle and an environment loading device, wherein the electrical cabinet detection mechanism is fixed on the bearing vehicle, and the environment loading device is fixedly arranged on a ground boss. When an electrical cabinet is detected, the electrical cabinet is placed in a second casing, a hatchdoor is closed, the environment loading device is enabled to be at a sealing state, according to an actual condition needing to be simulated, various parameters such as an environment temperature, humidity, environment dust density and the like are arranged through a computer, and the computer is utilized for control and monitoring, and storing correlation test information and detection data and then carrying out sequential detection on the electrical cabinet. According to the utility model, the structure is simple, the operation is convenient, through simulating an environment load in the actual condition, performance testing and reliability testing are performed on the electrical cabinet, the possibility of electrical cabinet faults generated in a numerical control machine tool application process is reduced, the numerical control machine tool maintenance and repair cost is decreased, and the reliability of the numerical control machine tool electrical cabinet during application is improved.