Medical Z-shaped translation bed

The invention relates to a medical Z-shaped translation bed which has the key points that two longitudinal rails are arranged below a bed board which bears a patient, and are overlapped with two expansion traverse rails which are fixed on a bed frame to form a parallelogram, four sets of combination pulleys are arranged at four intersections for connection and restrain the two groups of guide rails, and the longitudinal rails can do longitudinal and lateral motion in a horizontal plane, so the bed board can do motion along a Z-shaped path, and can be positioned above a sick bed through passing by a bedside cabinet, and the problem that the translation bed and the sick bed are difficult to be parallel and level and abutting joint during the bed moving process is overcome. Inner traverse rails in the expansion traverse rails can be stretched out of the translation bed to be placed on the sick bed, so convenience is brought to laterally moving the bed board. The bed board with the smooth surface is inclined for