The invention discloses a delayed coking-hydrofining-catalytic cracking joint technology. The delayed coking-hydrofining-catalytic cracking joint technology comprises a delayed coking unit, a hydrofining unit and a catalytic cracking unit, wherein a coking raw material is heated by a heating furnace and sent into a coking tower to produce coke and a light-weight product, and the light-weight product is fractionated by a fractionation tower, so as to obtain naphtha, gasoline, diesel, and coking wax oil; the coking wax oil is filtered to remove the particles with size greater than 25mu.m, the coking wax oil and other optional high-sulfur straight-run distillation wax oil are heated by the heating furnace, and are mixed with hydrogen, a mixture is sent into a hydrofining device, the obtained gas phase is treated and returned back to mix with the hydrogen, and the obtained hydrofining oil and optional pressure-relief slag oil or common-pressure slag oil are sent into the catalytic cracking unit, so as to obtain pyrolysis gas, catalytic gasoline, diesel and catalytic cracking oil slurry; the catalytic cracking oil slurry and the coking raw material are mixed and sent into the delayed coking unit. The delayed coking-hydrofining-catalytic cracking joint technology has the advantages that the CGO (coker gas oil) and VGO (vacuum gas oil) can be effectively treated, the sulfur content in the product is controlled to be less than 5ppm, and the service life of a hydrogenation catalyst is more than two years.