Fixed threshold civil air defense door structure

The utility model discloses a civil air defense door structure with a fixed doorsill, and relates to the technical field of civil air defense engineering, the civil air defense door structure comprises a ground, the ground is fixedly connected with a door frame, the bottom of an inner cavity of the door frame is provided with a doorsill body, the doorsill body is fixedly connected with the ground, and the inner side of the door frame is movably connected with a civil air defense door body. Through cooperative arrangement of the sinking grooves, the first supporting plate, the second supporting plate, the hydraulic cylinder, the piston rod and other structures, the sinking grooves are formed in the two sides of the door plate body, the first supporting plate is rotationally connected with the inner walls of the sinking grooves, and the second supporting plate is slidably connected with the first supporting plate; the piston rod pushes the second supporting plate to move upwards to drive the first supporting pl