Local synchronization multistage oil cylinder applicable to heavy load

The invention discloses a local synchronization multistage oil cylinder applicable to a heavy load. The local synchronization multistage oil cylinder comprises an oil cylinder (1), a lower cylinder cover (7), an upper supporting lug (8), a guide tape (9), a glyd ring (4), an O-shaped ring (10), an oil guide pipe (5), a buffer damping ring (6), a thrust level oil cylinder (2) and a speed level oil cylinder (3), wherein the thrust level oil cylinder (2) and the speed level oil cylinder (3) are connected in parallel; the glyd ring (4) and the O-shaped ring (10) are fixedly mounted in a sealing groove by compression; the guide tape (9) is mounted in a guide tape groove. When the oil cylinder works, the thrust level oil cylinder (2) and the speed level oil cylinder (3) extend out together, a large thrust can be output by the oil cylinder, and after the thrust level oil cylinder (2) moves in place, the speed level oil cylinder (3) synchronously moves in high speed. According to the oil cylinder, a step-by-step flexible structure and a synchronous flexible structure are fused, the large thrust can be output by the oil cylinder at the movement initial period, and high-speed stable movement can be realized at the movement last period.