Improved machining tool clamp

The invention relates to the technical field of plate machining, in particular to an improved machining tool clamp which comprises a left bottom plate, a base plate, a horizontal clamping mechanism and a vertical clamping mechanism. Two pressing plates in the horizontal clamping mechanism clamp a placed first welding part through cooperation of corresponding moving plates and bidirectional threaded rods, and meanwhile the welding part is located between the two pressing plates, so that subsequent alignment with a second welding part is facilitated; a first welding part is pressed downwards through a first driving set, a lower pressing plate is arranged to press the first welding part downwards, and the right end face of a positioning block makes tight contact with the first welding part, so that the position of the first welding part is positioned, and follow-up welding operation is facilitated; therefore, the second welding part moves downwards and gradually makes contact with the first welding part, a certa