Concrete block machining tool

The utility model relates to the technical field of concrete blocks, in particular to a concrete block machining tool which comprises a machining platform, a machining forming box is fixedly installed at the top of the machining platform, an L-shaped plate is fixedly installed at the top of the machining platform, and a lifting air cylinder is fixedly installed at the top of the inner wall of the L-shaped plate. A pressing plate matched with the machining forming box is fixedly installed at the bottom end of the lifting air cylinder, two sets of two-way screws are arranged on the lower half portion in the machining forming box, a rotating disc drives a twisting column, the twisting column drives a driving gear, the driving gear drives a driven gear through a tooth groove belt, and the driven gear drives the two sets of two-way screws to rotate. The driving gear and the driven gear drive the two sets of two-way screws to rotate, the two-way screws drive the sliding blocks at the two ends to get close to each o