The invention relates to an overturning and positioning type patient constraining bed. An overturning plate is relatively and rotationally connected with the inside of an overturning through groove, a pair of bilaterally and correspondingly-arranged lacings is bilaterally-symmetrically, respectively and fixedly connected with the lower surface of the overturning plate, and after the overturning plate is overturned, both the upper surface and the lower surface of the overturning plate are respectively flush with the upper surface of the bed plate; and a vertically-through pin hole is formed in the edge of the overturning plate, a pin shaft is relatively and rotationally connected with or hinged to the inside of the pin hole, correspondingly-arranged upper and lower anti-overturning fixed plates are respectively and fixedly connected with the upper end and the lower end of the pin shaft, the shape formed by the upper and the lower anti-overturning fixed plates and the pin shaft is U with an outward opening, and before and after the overturning plate is overturned, a bed plate on the sides of the anti-overturning fixed plates is buckled between the upper and the lower anti-overturning fixed plates. A pair of bilaterally-symmetrically-arranged lacing fixing plates is connected with the lower surface of the overturning plate in a leftward and rightward sliding manner, and the lacings are respectively, fixedly and correspondingly connected with the lacing fixing plates in pairs. A fixing plate horizontal groove in the left-right direction is concavely formed in the lower surface of the overturning plate, and the lacing fixing plates are connected with the fixing plate horizontal groove in a leftward and rightward sliding manner.