The invention relates to the field of building steel structures, in particular to an inclined steel butting structure. The inclined steel butting structure comprises a transverse steel assembly, a butting assembly, butting steel, an inclined adjusting assembly and a rectangular sleeve. The butting steel in the device is convenient to dismount, the angle of the butting steel can be adjusted, the butting steel can slide left and right to adjust the position, and thus the device adapts to the different using demands for building steel structures. The transverse steel assembly comprises a transverse steel bottom plate, transverse steel side plates, a hinging shaft, side sliding grooves, a placement groove, strip grooves and a strip groove plate; the transverse steel side plates are fixedly connected to the front end and the rear end of the transverse steel bottom plate correspondingly, the placement groove is formed in the right end of the transverse steel bottom plate, and the left end ofthe strip groove plate is hinged to the left end of the placement groove through the hinging shaft; and the multiple strip grooves are evenly distributed on the upper end face of the strip groove plate, and the right ends of the transverse steel side plates are provided with the side sliding grooves.