The invention relates to a T-shaped single side bolt fastening part and a use method. The T-shaped single side bolt fastening part comprises a bolt rod and a bolt head which are integrally connected,a clamping block and a locking nut, wherein the bolt head can penetrate through rectangular or waist-shaped installation holes arranged in a steel beam end plate and a steel vertical column and penetrates into the steel vertical column to rotate a set angle to be capable of contacting with the inner side face of the steel vertical column, the bolt rod is provided with a groove in the axis direction of the bolt rod, and on the same section of the bolt rod, a connection line, perpendicular to the groove bottom face, between the groove bottom face and the bolt rod section circle center and a longaxis line of the bolt head are in included-angle arrangement; the clamping block comprises a clamping block portion, the bottom face of the clamping block portion is provided with a clamping block convex rib, the clamping block portion can be slidably connected with the bolt rod, the two sides of the clamping block convex rib are provided with clamping limbs fixedly connected with the clamping block portion, the clamping limbs can contact with the end face of the bolt head, and the clamping block can be placed into the installation holes and contacts with the hole faces of the installation holes; and the locking nut can be in threaded connection with the bolt rod. The T-shaped single side bolt fastening part is convenient to construct and high in bearing force.