The utility model relates to a rack mills tooth rapid clamping device, top connecting device personally experiences sth. Part of the body at the bottom plate, is equipped with clamping mechanism on the device body, and the concrete structure of clamping mechanism is: the upper surface center of the device body is equipped with inverts trapezoidal locating piece, the both sides of device body end respectively through pivot swing joint clamp plate, the internal surface upper end of clamp plate be equipped with with the locating piece corresponding inclined plane in trapezoidal side, wait to process the rack setting in two inclined planes of locating piece and clamp plate, be equipped with circular through -hole on the device body, be equipped with diclinic wedge kicking block in circular through -hole, the tail end and the piston rod of reinforcement cylinder of diclinic wedge kicking block are connected, and reinforcement cylinder and device body coupling, be equipped with the ejector pin at the lower extreme internal surface of clamp plate, the terminal surface of ejector pin passes the scarf contact of the device body and diclinic wedge kicking block. The device adopts pneumatic slide wedge to press from both sides tight mode, carries the high tooth strip and presss from both sides tight stability, reduces intensity of labour simultaneously, improves production efficiency.