The invention discloses a storage cabinet for machining tools. The storage cabinet comprises a cabinet body and multiple supporting plates fixedly installed in the cabinet body. A storing box used for storing the machining tools is installed at the upper end of each supporting plate in a sliding manner. Connecting protrusions are fixedly installed on the left end faces of the storing boxes. Multiple sliding grooves extending front and back are formed in the left end wall of the cabinet body. Through grooves penetrating the cabinet body are formed in the right ends of the sliding grooves. Sliding blocks are further arranged in the sliding grooves. The connecting protrusions penetrate the through grooves and are fixedly connected with the sliding blocks. A guide rod is fixedly installed between the front wall and the rear wall of the upper end of the cabinet body, and a screw rod is rotatably installed between the front wall and the rear wall of the lower end of the cabinet body. A moving block is installed on the guide rod, the lower end of the moving block is in threaded fit with the screw rod, and thus the moving block can be driven to move forwards and backwards by the screw rod.