The invention relates to a fixing process of a pipeline bracket. The fixing process comprises the following steps: I, manufacturing a prefabricated piece in a workshop; II, conveying the finished prefabricated piece to a module mounting position; III, threading a bolt and a prefabricated coated arc-shaped clamp; IV, temporarily supporting and fixing a section steel bracket and threading a bracket supporting plate by a bolt fastening assembly; V, fastening the arc-shaped clamp point by point; VI, mounting a pipeline to the bracket; VII, removing the section steel temporary fixing device and performing inspection submission on the mounted bracket; and VIII, hanging a plate to identify the bracket which is qualified by inspection. The fixing process provided by the invention not only can finish all welding prefabricating work of the pipeline bracket in the workshop to solve the problem of wasting manpower and material resources due to field grinding and paint repair, but also can fish corrosion prevention and coating of the bracket in the workshop, so that the damage on the paint on the surface of the structure by field welding is greatly reduced, and influence on the structure, electric equipment, instruments, fitting and the like by field fire operation is reduced.