Automatic fixture opening and closing device

The utility model discloses an automatic fixture opening and closing device which comprises a base, a push mechanism, a first gear, a second gear, a reset element, a turning piece, first clamping plates and second clamping plates, wherein the base and the push mechanism are arranged on a worktable; the first gear and the second gear are respectively pivoted to the base and are meshed with each other; the first clamping plates are horizontally fixed on the base; one end of the turning piece is fixed on a central shaft of the second gear; the second clamping plates are fixed on the turning piece; a shaft pin is arranged at the eccentric position of the first gear; an output end of the push mechanism is pivoted to the shaft pin; one end of the reset element is fixed on the shaft pin, and the other end of the reset element is fixed on the worktable. The automatic fixture opening and closing device disclosed by the utility model has the advantages of simple structure and convenience in control.