The invention discloses a safe bridge which comprises a channel bottom plate, a locking mechanism and an escape mechanism, wherein the locking mechanism is fixedly arranged on the channel bottom plate, and the escape mechanism is fixedly arranged under the channel bottom plate; the locking mechanism comprises two pairs of tightened gears and racks meshed with the tightened gears; and the escape mechanism comprises a connecting rod and a rope pulley, the connecting rod is fixedly arranged on the channel bottom plate through bolts, and the rope pulley is fixedly arranged under the connecting rod. First box bodies are fixedly arranged on the left side and the right side of the rear end of the channel bottom plate, and a sliding chute is formed in each first box body. A sliding block is arranged in each sliding chute in a mode sliding fit, and a rack is fixedly arranged on the sliding block. A second box body is fixedly arranged on each first box body, and a transmission chamber is arranged in the second box body. A third box body is fixedly arranged outside each second box body, and a first motor chamber is arranged in the third box body. A first motor is arranged in each first motorchamber in a mode of power matching and is fixedly provided with a rotating shaft. The rotating shafts are connected with the tightened gears through splines.