Machining milling groove positioning tool

The utility model provides a machining milling groove positioning tool which comprises a base plate, two sets of adjusting pieces are installed on the base plate, a clamping piece is installed on each adjusting piece, each clamping piece comprises an installation block, a containing groove is formed in one side of each installation block, a threaded sleeve is rotatably installed on the inner side wall of each containing groove, and a clamping piece is installed on the threaded sleeve. A threaded rod is in threaded connection with the interior of the threaded sleeve, a driving block and a pressed block are slidably mounted in the placement groove, an extrusion spring is connected between the driving block and the pressed block, the threaded rod is connected with the driving block, an extension rod is mounted on one side of the pressed block, and a clamping plate is arranged at the other end of the extension rod. The liquid level height in the transparent capillary tube is observed through the measuring scales,