Tissue paper surface sizing process taking corn starch as raw material

The invention belongs to the field of new papermaking processes, and particularly relates to a tissue paper surface sizing process taking corn starch as a raw material, which mainly adopts the following improved processes: 1) adding 25-35kg of high-molecular polyol polymer into each ton of starch as a starch modifier in a corn starch dissolving stage; (2) a heating system is additionally arranged in a feeding station, so that the temperature of sizing starch liquid is increased to 65 DEG C from 55 DEG C, and the fluidity is improved; and (3) adding Novozymes CWB-3515 cellulase into the used starch liquid according to the dosage of 2-3ppm per ton of starch to decompose paper lint. Through comprehensive application of the means, the problem that the corn starch cannot be subjected to surface sizing on tissue paper by using a film transfer sizing machine is solved; meanwhile, the problem that the grooves of the sizing metering rod are blocked due to protein flocculation is solved, the service life of the meterin