The utility model relates to the technical field of reinforcement cage lowering construction structures, in particular to a multifunctional well support for pile foundation reinforcement cage construction positioning. The device comprises a #-shaped frame surrounding the periphery of a drill hole; wherein the #-shaped frame comprises four cross beams which are connected end to end, each cross beamis provided with a supporting plate which is perpendicular to the cross beam and extends towards the center of the #-shaped frame, and the device is characterized by further comprising a horizontal steel pipe which is fixed on the #-shaped frame; the lower end of the horizontal steel pipe is provided with a rigid connection structure which is vertically arranged and used for positioning and supporting the reinforcement cage. The supporting plate plays a temporary supporting role in the lowering process of the reinforcement cage; the supporting plate supports all the weight of the reinforcement cage through the hanging bars to ensure that the reinforcement cage does not sink; the vertical steel pipes and the horizontal steel pipes play roles in horizontally positioning the reinforcement cage and preventing the reinforcement cage from floating upwards; the multifunctional nursing bed is simple in structure, multiple in function, easy to operate and capable of being repeatedly used.