A latch-type tightening device structure comprises a body constituted by a seat and a housing, wherein an interior of the body is provided with a one-way braking mechanism which enables a rope to glide in one direction. A rope enters into and reeves around the tightening device by which the rope can be gliding in one direction latching. A front edge of the body is provided with a tenon or a latching slot, such that the tightening device can be quickly locked with a fitting part in application.