The invention belongs to the technical field of cold-rolling emulsified spot treatment, in particular to a blocking method of emulsion edge fluid channeling during the rolling process of a cold rolling mill, which is applied to various cold rolling mill sets. The blocking method is characterized by comprising the following steps: setting a left upper injection baffle plate and a right upper injection baffle plate on an upper emulsion injection beam at the entrance side of the cold rolling mill, and setting a left lower injection baffle plate and a right lower injection baffle plate on a loweremulsion injection beam at the entrance side of the cold rolling mill; according to the width of incoming band steel, adjusting the width between the left upper injection baffle plate and the right upper injection baffle plate so that the injection area of emulsion of the upper emulsion injection beam has the same width as the supplied band steel and are superposed with each other; and adjusting the width between the left lower injection baffle plate and the right lower injection baffle plate so that the injection area of emulsion of the lower emulsion injection beam has the same width as thesupplied band steel and are superposed with each other. The blocking method can effectively avoid the problem of fluid channeling of the emulsion for ultra-wide injection to an outlet side.