The utility model discloses an oblique cutting device for hardware products. Including a body, an electric push rod is fixedly mounted on the lower surface of the upper end of the main body; the lowerend of the electric push rod is fixedly connected with a supporting plate. The supporting plate and the main body are in sliding connection through a first sliding rod and a first sliding groove; thefirst sliding rod and the first sliding groove are formed in the supporting plate and the side wall of the main body correspondingly. A motor is fixedly mounted on the lower surface of the supportingplate; the output end of the motor is fixedly connected with a cutter; the cutter is fixedly installed on a small rotating shaft of the motor, a fixed plate is fixedly installed on the upper surfaceof the lower end of the main body, second sliding grooves are formed in the two sides of the fixed plate, a movable plate is arranged at the upper end of the fixed plate, and second sliding rods are fixedly installed on the two sides of the lower surface of the movable plate. The oblique cutting device is simple in structure and convenient to operate, oblique cutting at different angles can be accurately conducted on products, and the production quality of the products is guaranteed.