Machining positioning device

The utility model discloses a machining positioning device. The device comprises a U-shaped operation table, a first supporting plate and a second supporting plate which are in sliding fit with the two side walls of the U-shaped operation table respectively are connected into the U-shaped operation table. Grooves I are formed in the bottoms of the support plate I and the support plate II; a turntable I is rotationally connected into the groove I; a threaded column I is arranged on the turntable I; the other end of the threaded column I is connected with a hand wheel I; a plurality of T-shapedgrooves are formed in the upper surface of the supporting plate II; a clamping block is arranged above the second supporting plate in a sliding mode, a second groove is formed in the clamping block, asecond rotating disc is arranged in the second groove in a rotating connection mode, a second threaded column is arranged on the second rotating disc in a connecting mode, a vertical plate is arranged on the second supporting