Safety protection fence for road and bridge construction

The utility model belongs to the technical field of protective fences, particularly relates to a safety protective fence for road and bridge construction, and aims to solve the problems that the labor intensity of workers is increased due to the fact that most of existing protective fences are manually carried during moving, and the occupied space is large during storage. Telescopic rods are fixedly arranged on the two sides of the main supporting column correspondingly, secondary supporting columns are fixedly connected to the two telescopic rods correspondingly, an inner cavity is formed in the main supporting column, a motor is fixedly arranged in the inner cavity, and an extension mechanism is connected to an output shaft of the motor; the extending mechanism comprises two rotating wheels, a belt, two screw rods, two sliding blocks, two first connecting rods, two second connecting rods and two connecting blocks, when needing to be moved, the movable type lifting device does not need to be manually carried