Transmission box for door and window transmission device

The utility model relates to the technical field of door and window hardware fittings, in particular to a transmission box for a door and window transmission device, which comprises a track plate with a sliding chute on one side, two sliding plates are slidably arranged in the sliding chute, a box body is fixedly arranged on one side of the track plate with the sliding chute, and a first sliding hole for communicating the inside of the box body with the sliding chute is arranged on the box body. A stress plate is slidably arranged in the box body in the direction close to or away from the sliding plate, a spring is installed between the stress plate and the box body, the two sides of the stress plate are each hinged to a transmission plate, the other end of each transmission plate penetrates through the corresponding first sliding hole and then is hinged to the sliding plate, and a cam rotationally connected with the box body is arranged on the side, away from the spring, of the stress plate. A square hole is