The utility model relates to a roll line cold bed stack pallet mechanism, include base, first crossbeam, second crossbeam, move roof beam, dolly, rollgang and lifting mechanism, said first crossbeam and second crossbeam all erect on the base, and first crossbeam and second crossbeam overall arrangement in rollgang periphery, lifting mechanism is connected with first crossbeam and second crossbeam, move that the roof beam both ends are connected with first crossbeam and second crossbeam respectively and to move roof beam overall arrangement direction the same with the rollgang axial, the dolly setting is moved on the roof beam, also including the running gear who is used for driving dolly reciprocal walking on moving the roof beam. This roll line cold bed stack pallet mechanism utilizes the travelling car with rolled piece from the cold bed lifting that goes up, then to the rollgang and steadily put down, appears blocking the problem that hinders when preventing crooked rolled piece transportation.