The invention discloses a joint for inserting of a rack pipe. The joint comprises a joint base block and inserting blocks. The inserting blocks comprise a first inserting block, a second inserting block and a third inserting block, the first inserting block and the second inserting block are perpendicularly arranged on the two adjacent surfaces of the outer side of the joint base block, the thirdinserting block is perpendicularly arranged on the surface, adjacent to the face where the first inserting block and the second inserting block are located, of the outer side of the joint base block,a thread hole is formed in the surface, without the inserting blocks, of the outer side of the joint base body, welding line avoiding grooves are formed in one side faces of two side faces of the first inserting block, the second inserting block and the third inserting block in an inwards-concave manner, the surface, without t he inserting blocks, of the outer side of the joint base block is provided with columnar counterbore holes extending to the corresponding inserting blocks. Through the above manner, according to the joint for inserting of the rack pipe, screws are located in the columnarcounterbore holes and are not exposed, use convenience and load capacity are improved, and detaching for adjustment is achieved.