Wrench

The invention relates to the technical field of machining, in particular to a wrench which comprises a handle, a speed increasing device, a limiting device, a clamping sleeve, an operating head and an end cover. The speed increasing device comprises a speed increasing gear, a gear shaft and a gear ring, the speed increasing gear is arranged between the gear ring and the gear shaft, and the gear shaft is opposite to the gear ring and the speed increasing gear in rotation direction; the limiting device is arranged to be in rigid connection with the end cover, the limiting device can limit movement of the speed increasing device, the speed increasing device is connected with the end cover in a nested mode, the handle is arranged on the outer side of the gear ring, and the operation head and the gear shaft are in rigid connection through the clamping sleeve. The invention provides a wrench which aims at improving the machining quality and the machining efficiency by multiple times when the wrench is used by arran