Cutting device for flat plate workpieces

The invention relates to a cutting device for flat plate workpieces. The cutting device comprises a bottom board and side boards which are distributed in a bilateral symmetry manner. A motor is fixedon the bottom board and connected with a rotary disc. A circular column is fixed on the rotary disc and is in horizontally slip fit with an I-shaped board. The I-shaped board is installed on the sideboards in a vertically-sliding manner. Cutting mechanisms are symmetrically distributed on left and right sides of the I-shaped board. The cutting mechanisms comprise cutter boards and swing rods which are hinged onto tops of the side boards and in inverted-V shapes. First strip-shaped through holes are arranged on one sides, close to the circular column, of the swing rods. The I-shaped board is fixedly equipped with first sliding columns matching the first strip-shaped through holes. One sides, departing from the I-shaped board, of the swing rods are provided with second strip-shaped throughholes. The cutter boards ar