Clamping tool of machining center

The utility model relates to a clamping tool of a machining center, which comprises a bottom plate, supporting legs which are oppositely arranged are erected at the lower end of the bottom plate, at least two linear sliding rails which are arranged along the width direction of the bottom plate are arranged at the other end, opposite to the supporting legs, of the bottom plate, and a sliding block is arranged above the bottom plate. A sliding groove matched with the linear sliding rail is formed in the position, corresponding to the linear sliding rail, of the end, facing the linear sliding rail, of the sliding block, the sliding block is connected with the linear sliding rail through the sliding groove and can slide along the linear sliding rail, and a side plate perpendicular to the bottom plate is arranged on one side of the bottom plate. A first positioning structure which extends towards the other end and enables the sliding block to abut against the side plate along the linear sliding rail is arranged at