Device for lowering concrete well pipe in tube well

The utility model discloses a device for lowering a concrete well casing in a tube well. The device solves the problem that in the prior art, when the concrete well casing is lowered, the concrete well casing needs to be improved. The well casing centering device comprises a well casing bottom support, a well casing centering support and a winding device. Wherein the well casing bottom support ispositioned at the bottom of the lowest well casing; the well casing centering bracket is positioned at a wellhead; the central axis of the plane corresponds to the central axis of the wellhead; the inner surface is attached to the outer surface of the to-be-placed well casing at the highest position; the winding device comprises a positioning support, a winding rope steering support, a winding rope and a winding control roller. One end of the positioning support is located on one side of a wellhead, the winding rope is connected with the positioning support, then penetrates through the well casing bottom support and i