Formwork-free hollow building block for pouring constructional column

The utility model discloses a formwork-free hollow building block for pouring a constructional column. The formwork-free hollow building block comprises two wing plate parts and a connecting part, wherein the two wing plate parts are arranged at an interval; the connecting part is connected between the two wing plate parts; the wing plate part is in a convex shape and is used for forming combed joint shapes for being connected with a wall body on the left and right sides of the hollow building blocks after the plurality of hollow building blocks are stacked in sequence; the connecting part is positioned on one side of the wing plate part and is used for respectively forming a first opening, a second opening and a third opening on the other side of the hollow building block in the vertical direction; the first opening is used for enabling the steel bar bundling body to enter the channel through the first opening when the steel bar bundling body is sleeved. According to the utility model, the construction proce