The invention relates to the technical field of connection of building structures, and discloses an inclined outer ring plate fabricated cross connecting beam-column joint. The inclined outer ring plate fabricated cross connecting beam-column joint comprises a square steel tube column, H-shaped steel beams and beam-column connecting assemblies. Each beam-column connecting assembly comprises two groups of miter plates and T-shaped connecting pieces, wherein the two groups of miter plates are arranged symmetrically in a up and down mode; each group of miter plates comprises four identical standard miter plates, each standard miter plate comprises a horizontal part, a vertical part and connecting lugs, and a T-shaped sliding piece is arranged on the back surface of each horizontal part. The T-shaped connecting pieces are provided with T-shaped sliding grooves matched with the T-shaped sliding pieces. According to the inclined outer ring plate fabricated cross connecting beam-column joint,the miter plates are used as standard splicing pieces, the integrity of an outer ring plate is ensured while the strength of a joint area is ensured, the outward movement of plastic hinges is realized, the miter plates provide sufficient construction space, the installation is convenient, and the miter plates can be replaced in time after being damaged; and welding of all components is completedin a factory, the connection is completely carried out through bolts on site, the completely fabricated construction is realized, the quality problems caused by site welding are avoided, and the construction progress is speeded up.