The invention discloses a papermaking auxiliary agent. The papermaking auxiliary agent is prepared from the following main raw materials in parts by weight: 10-16 parts of carboxymethyl chitosan, 6-10 parts of polyacrylamide, 12-16 parts of talcum powder, 8-18 parts of quartz powder, 3-5 parts of polyethylene glycol, 1-4 parts of 2,2,4-trimethyl-1,3-pentanediolmono(2-methylpropanoate), 2-5 parts of alkylphenol ethoxylates, 1-4 parts of polyoxypropylene glycerol ether, 1-2 parts of sodium benzoate, 2-4 parts of vegetable wax oil, 1-2 parts of ammonium sulfate, 2-3 parts of disodium hydrogen phosphate and 3-6 parts of lactitol. The papermaking auxiliary agent disclosed by the invention adopts a simple process flow; and bad foams in a preparation process of paper pulp can be eliminated and the pulp is dispersed very well, so that paper sheets have very good tensile strength, elongation percentage, printing smoothness, whiteness, tearing strength and folding endurance.