The invention discloses a method for improving the efficiency of fluorescent whitening agent in high yield pulp-containing paper, which comprises the following steps: weighing mixed pulp; mechanically stirring; adding aqueous solution of fluorescent whitening agent, aqueous solution of light calcium carbonate, aqueous solution of cationic polyacrylamide and aqueous solution of cationic starch in turn, and mixing uniformly; making sheets on a standard sheet machine; and squeezing by a squeezing machine, transferring to an environment at constant temperature and constant humidity, and drying for 24 hours. The method of the invention can improve the efficiency of the fluorescent whitening agent in the high yield pulp-containing paper; after the cationic starch is added, particularly 0.8 to 1.2 percent of cationic starch is added, the D65 whiteness of the paper is increased by 0.5 to 0.7 unit, CIE whiteness 2 to 3 units, and fluorescence content 1 percent, compared with those of a reference sample without additional cationic starch. The method of the invention is simple in process, low in production cost and highly compatible with wet-end chemicals.