Fixing device for keeping door in half-open state

The invention discloses a fixing device for keeping a door in a half-open state. The fixing device for keeping the door in the half-open state is characterized in that the fixing device comprises a bolt mechanism mounted on the back side of the door and an angle positioning mechanism mounted on a door frame; the bolt mechanism comprises a pin bolt and a pin plate, and a pin hoop used for movement of the pin bolt is arranged on the pin plate; the pin bolt comprises a pin rod, a spring and a pin nose, the pin rod, the spring and the pin nose are connected in sequence, and the axial direction of the spring is the same as that of the pin rod; and the angle positioning mechanism comprises a mounting block, a plurality of nose holes allowing the pin nose to be inserted therein are formed in the mounting block, and the nose holes are arrayed on the same horizontal plane in an arc shape. According to the fixing device for keeping the door in the half-open state, the door can be opened and closed at multiple angles, and the door can automatically return to the half-open state after external force is released. The fixing device for keeping the door in the half-open state is simple in structure and high in practicability.