Bed with liftable mattress

The utility model relates to a bed with a liftable mattress, which utilizes a mechanical device so that the mattress can easily ascend and descend. The bed with the liftable mattress comprises a bed frame, an inner-layer support plate, the mattress, a backrest, a manual hydraulic lifting table, a small lug boss, a sleeve tube, a rocking handle and a manual handle, wherein the inner side of the bed frame is welded with the inner-layer support plate, the upper surface of the inner-layer support plate is fixed with the manual hydraulic lifting table, the manual hydraulic lifting table is arranged in a bed body, the outer side of the manual hydraulic lifting table is provided with the small lug boss, and the small lug boss is connected with the rocking handle through a connecting sheet and a pin. The rocking handle is connected with the manual handle through the pin, the sleeve tube with internal screw threads is arranged on the manual handle, the end part of the rocking handle is provided with external screw thr