Large concrete curing cover

The utility model discloses a large concrete curing cover which comprises a canvas support longitudinally placed in a concrete pipe, a guide long hole communicated with the interior of the canvas support is formed in the side wall of the canvas support, a ball screw is rotationally installed in the canvas support, an opening and closing frame is installed outside the canvas support through a pin shaft, and a plurality of through holes are formed in the opening and closing frame. A lead screw nut is installed on the ball screw in a matched mode, and a traction connecting rod is connected between the lead screw nut and the opening and closing frame. A loading plate is fixedly connected to the ball screw, a flat top is arranged on the loading plate, and a cover body used for wrapping the concrete pipe in a sealed mode is arranged between the flat top and the opening and closing frame. The hollow cylindrical canvas support is arranged in the concrete pipe, the ball screw is arranged on the hollow cylindrical canv