The invention discloses a connecting plate type barrier-free bus door driven by a rod-free cylinder. The connecting plate type barrier-free bus door driven by a rod free cylinder comprises a connecting plate set, an air general control system, a connecting plate rod-free cylinder, a connecting plate rod-free cylinder, a bus front door cylinder and a bus rear door cylinder, wherein the connecting plate set is arranged on the lower portion of a bus rear door floor. The air general control system comprises a front door air control system, a rear door air control system, a connecting plate air control system and an air source general road system, wherein the air source general road system is used for providing pressure source for the front door air control system, rear door air control systemand connecting plate air control system. Two smooth supporting rods are arranged on the lower portion of the bus rear door floor, wherein the two smooth supporting rods are fixedly arranged in parallel, and the two smooth supporting rods are used for supporting the connecting plate set and providing guiding support for the sliding of the connecting plate set. The connecting plate rod-free cylinderis arranged between the two smooth supporting rods. The connecting plate rod-free cylinder comprises a rod-free cylinder guiding rod and a rod-free cylinder sliding platform, wherein the rod-free cylinder guiding rod is fixedly arranged, and the rod-free cylinder sliding platform works on the rod-free cylinder guiding rod to drive the connecting plate set to extend from the bus rear door floor toconnect with a bus platform to achieve the barrier-free accessibility.