The invention discloses a sow foaling pen which comprises a fixed pen, a movable pen, a first fixing frame, a second fixing frame, a feeding trough fixing frame, a movable door, a feeding trough, a first sliding rail and a second sliding rail, wherein the movable door is arranged on the second fixing frame. The size of a sow activity area can be freely adjusted, health of sows is protected, the production benefit of the sows is improved, facility utilization rate is increased, investment is reduced, the problem of different temperature requirements of the sows and piglets is solved, the survival rate of the piglets is increased, feeders can conveniently take care of the sows, the sows cannot be disturbed, and the sow foaling pen has the advantages of convenience in disassembly and flexibility and convenience in mounting, can be applied to mounting on new and old pig farms without particularly adding supporting facility, and is wide in applicability.