Combined lifting bed

The utility model discloses a combined type lifting bed, relates to the technical field of lifting beds, and comprises bed frames, the bed frames are two in bilateral symmetry, the sides, close to each other, of the bed frames are fixedly connected with two connecting screw rings which are symmetrical front and back, and the inner walls of the connecting screw rings are fixedly connected with extension mechanisms in a sleeved mode. Inner cavities of the two bed frames are rotationally connected with transmission mechanisms, the lower sides of the two transmission mechanisms are fixedly connected with four leg mechanisms distributed in a rectangular mode in a sleeving mode, the bed frame located on the right side is fixedly connected with a bed head mechanism, the bed frame located on the left side is fixedly connected with a bed tail mechanism, and an extension mechanism comprises an extension rod; and the two ends of the two extension rods are fixedly connected to the inner sides of the connecting screw ring