The invention discloses a process for online increase of a chill pipeline to a refined-desulfurization pre-hydrogenation catalyst. The process comprises a heater, a hydrogenation pre-convertor, a primary hydrogenation convertor, a primary zinc oxide desulfurizer, a secondary hydrogenation convertor, a secondary zinc oxide desulfurizer and a chill header pipe, wherein the heater, the hydrogenationpre-convertor, the primary hydrogenation convertor, the primary zinc oxide desulfurizer, the secondary hydrogenation convertor and the secondary zinc oxide desulfurizer are arranged sequentially, andthe chill header pipe is used for conveying chill coal gas; and a plurality of branch pipes are arranged on the chill header pipe, and the other end of each branch pipe is separately introduced to a trough inlet of the hydrogenation pre-convertor, a trough inlet of the primary hydrogenation convertor and a trough inlet of the secondary hydrogenation convertor so as to control a temperature of a bed layer. According to the process, through increasing a coal gas chill header pipe at the trough inlets of the hydrogenation convertors, the catalyst bed layer is liable to overtemperature during curing or new trough pouring of a replaced raw catalyst, added chill coal gas is used for cooling the catalyst bed layer when the temperature of the bed layer rises too fast, so that the problem of shutdown curing is avoided, online curing is achieved, the production output of LNG (Liquefied Natural Gas) is not affected, and production loss is reduced.