The invention discloses a manual and electric self-service automatic excrement collecting 
hospital bed capable of changing into a 
sitting posture from a 
lying posture. A 
fixed bed frame is fixed on 
bed legs; a fixed 
waist bed plate frame is fixed in the middle of the 
fixed bed frame; and two ends of the 
fixed bed frame are respectively connected with a movable back 
bed plate frame and a movable leg bed plate frame by hinges. A bed frame edge which is hinged to the movable back bed plate frame and the fixed 
waist bed plate frame are convex; a bed frame edge which is hinged to the fixed 
waist bed plate frame and the movable back bed plate frame is concave; and when the horizontal bed is in the 
lying posture, the concave edge and the convex edge complement each other to form a smooth plane. The movable back bed plate frame can erect around the hinges by pulling a hexagonal inner-hole bidirectional 
ratchet wrench, a single end of the movable leg bed plate frame extends downwards around the hinges, and then the 
lying posture of the 
hospital bed is changed into the 
sitting posture. After the movable back bed plate frame erects around the hinges, the concave edge of the fixed waist bed plate frame becomes a 
defecation hole. When the movable back bed plate frame erects around the hinges, after the direction of a traction 
rope connected to the lower end of the movable back bed plate frame is changed via a fixed 
pulley, a 
sewage bag movable transverse hanging rod is pulled to move forwards along a 
sewage bag sliding transverse hanging rod guiding rod in the horizontal direction, so that a 
sewage bag hung on the sewage bag sliding transverse hanging rod is aligned to the position below the 
defecation hole.