Clamping jig for CNC precision machining

The utility model discloses a clamping jig for CNC (computer numerical control) precision machining, which comprises a seat body provided with a top side, a bottom side opposite to the top side, and a through hole penetrating up and down; at least one base is arranged on the top side of the seat body, a product placing area is formed at the upper end of the base, a plurality of through adsorption channels are formed in the base, and the adsorption channels are communicated with the product placing area and the through holes; a pressing body which can be close to or far away from the product placing area on the base is horizontally arranged above the base body; a reinforcing cavity is arranged on the bottom side of the base body, and the reinforcing cavity is communicated with the through hole and a vacuum pump body. According to the clamping jig for CNC precision machining, it is guaranteed that the whole part cannot move in the machining process, it is also guaranteed that the welding quality cannot be affec