The utility model relates to a roof bracket system which mainly comprises a waterproof insulating pad, civil engineering buttresses, support columns, channel steel and horizontal pipeline clamps, wherein the horizontal pipeline clamps are used for clamping pipelines in which mediums pass; the bottoms of the horizontal pipeline clamps are fixed to the channel steel; the bottoms of the support columns are buried into the civil engineering buttresses; the channel steel is open toward the direction perpendicular to the support columns; the waterproof insulating pad is mounted above a waterproof layer of a roof floor plate onto which a roof bracket is needed to be mounted; the civil engineering buttresses are mounted on the waterproof insulating pad. The roof bracket system does not damage the waterproof layer of the roof, is convenient and rapid to construct, small in investment and is particularly applicable to transformation engineering, the vacant space on a roof can be sufficiently utilized, and tube racks are not needed to be additionally arranged inside (outside) a factory.