The invention relates to a shield duct piece steel mould end side plate full-automatic open-close device comprising a turnplate, two pairs of joint levers, one pair of side palte joint levers, two side plates, one pair of end plate joint levers, two end plates, a pedestal, end plate and side plate translational lead rails, and the like, wherein the turnplate is connected with the pedestal by a revolute pair and then is respectively connected with the two pairs of joint levers by revolute pairs; the two pairs of joint levers are respectively connected with the two pairs of side plate joint levers and the two pairs of end plate joint levers, which are fixed on the two side plates and the two end plates by revolute pairs; and the four revolute pairs on the turnplate can be on the same circleand not on the same circle. The device has simple structure, easy manufacture and simple and convenient operation, can realize automatic open and close and enhances the efficiency of duct piece manufacture.