The invention provides a tool clamp used for machining the upper wire outlet end of an embedded pole on a lathe. The tool clamp is provided with a main shaft, a flange plate, a threaded shaft and a polished shaft which are coaxially and fixedly connected in sequence. A nut part is arranged on the threaded shaft. A pressing block is arranged on the polished shaft. Clamp supporting plates are arranged on the two sides of the threaded shaft and the two sides of the polished shaft. One end of each clamp supporting plate is perpendicularly and fixedly connected with the outer side of the flange plate, and the other end of each clamp supporting plate is perpendicularly and fixedly connected with the outer side of a clamp base. A through hole coinciding with the axis of the pressing block is manufactured in the middle portion of the clamp base. One side of the pressing block is in contact connection with the bearing face of the nut part, and the other side of the pressing block is in contact connection with a clamped workpiece. A groove matched with a to-be-machined face of the clamped workpiece in shape is formed in the pressing face of the pressing block, and the perpendicular bisector of the groove coincides with the axis of the through hole. According to the tool clamp used for machining the wire outlet end on the embedded pole on the lathe, the perpendicular precision of the axis of an upper wire outlet hole in the upper wire outlet end of the embedded pole and the end face where the hole is formed is ensured, meanwhile machining of the upper wire outlet hole can be completed on the common lathe, and the input cost of equipment is greatly reduced compared with the input cost of machining conducted through a machining center.