The utility model relates to the technical field of door and window performance detection devices, in particular to a door and window heat insulation performance detection device which comprises a mounting plate, a box body, a partition plate, a connecting fence, a connecting block A, a connecting block B, a temperature sensor, a display module, a sliding groove, a movable block, a connecting frame and a heating wire. The partition plate is fixedly connected to the middle of the box body and divides the inner space of the box body into two equal rectangular cavities, the connecting fences are fixedly connected to the front ends of the left side and the right side of the box body correspondingly, and the connecting blocks A are fixedly connected to the positions, corresponding to the upper end and the lower end of the partition plate, of the front side surface of the box body; and the connecting blocks B are fixedly connected to the front side surface of the box body corresponding to the middle parts of the connecting columns. The device has the effects of low manufacturing cost, simplicity and convenience in operation, relatively accurate detection value and good safety.