The invention relates to paper sheet surface sizing starch glue and a processing method thereof and belongs to the field of starch glue. The processing method comprises the steps of mixing starch and water, then adding starch compound enzyme and heating and boiling to obtain a starch glue initial product; deactivating enzyme in the starch glue initial product, adding starch glue enhancer and mixing to obtain the paper sheet surface sizing starch glue. The starch complex enzyme is prepared from alpha-amylase, beta-amylase, glycerinum and salt, and the weight ratio of the alpha-amylase to the beta-amylase to the glycerinum to the salt is (50 to 65):(5 to 10):(10 to 20):(2 to 5). The starch glue enhancer is prepared from hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose, liquid caustic soda and penetrant, and the weight ratio of the hydroxypropyl methyl cellulose to the sodium carboxymethyl cellulose to the liquid caustic soda to the penetrant is (30 to 40):(20 to 30):(2 to 4):(0.5 to 1). The processing method has a simple technology and low production cost and greatly reduces wastewater treatment load in a production process. In addition, the starch glue has good quality, can solve the problems of starch glue colloidal particle solution crystallization and poor storage viscosity stability and meets a requirement of common printing paper.