Movable inner formwork device for box culvert

The utility model belongs to the technical field of box culverts, and particularly relates to a box culvert movable inner formwork device which comprises a foundation cushion layer and a trolley support, steel trusses are fixed to the left side face and the right side face of the foundation cushion layer through bolts, and an adjustable supporting hydraulic cylinder is fixedly installed on the top face of the trolley support. And a shaping frame is bolted to the top end of an output shaft of the adjustable supporting hydraulic cylinder through a bolt, a shaping formwork is fixedly bolted to the outer surface of the shaping frame, walking motors are fixedly installed at the left end and the right end of the bottom face of the trolley support correspondingly, and steel rails are slidably clamped to the bottom ends of the walking motors. Through the arrangement of the walking motor and the steel rails and the use of the walking motor, the steel rails and matched components of the walking motor and the steel rail