The invention discloses an infrared wide-angle temperature measurement window which comprises a window mounting sleeve, an infrared lens, a lens locking cover, a window inside diaphragm and a mounting nut, wherein the infrared lens is arranged at one end of the window mounting sleeve, and the window inside diaphragm is arranged at the other end of the window mounting sleeve; external threads are formed in two ends of the window mounting sleeve; internal threads matched with the external threads of the window mounting sleeve are formed in the inner walls of the mounting nut and the lens locking cover; the lens locking cover is in threaded connection with the window mounting sleeve after compressing the infrared lens; and the mounting nut is in threaded connection with the window mounting sleeve after compressing the window inside diaphragm. The infrared wide-angle temperature measurement window has the benefits that the structure is simple, the manufacturing is convenient, and the mounting can be effectively performed according to the specific positions in site; the cost is low, and the effect is good; and further, during temperature measurement, by virtue of the infrared wide-angle temperature measurement window, the temperature can be measured without opening a switchgear body of an internally installed switchgear, so that the work efficiency of temperature measurement for a connector inside the internally installed switchgear is substantially improved.