Balance weight for roller shutter based on synchronous lifting roller shutter system

The utility model discloses a balance weight for a roller shutter based on a synchronous lifting roller shutter system, and relates to the technical field of roller shutter systems. The counterweight comprises a counterweight body, a group of side beams and a lifting mechanism, outer metal plates are fixed at two ends of the counterweight body through connecting seats, the side beams are arranged on two sides of the counterweight body, each side beam comprises a rectangular upright post with two sealed ends, a sealing cavity is arranged in each rectangular upright post, and a magnetic connecting plate is slidably connected in each sealing cavity. The outer metal plate slides along the outer side of the rectangular stand column and is magnetically connected with the magnetic connecting plate. Through the design of the air cylinder type side beams and the connection between the magnetic connecting plates in the rectangular stand columns and the outer metal sheets installed on the counterweights, the counterweig