The invention provides a corn starch process water protein recovery technique which comprises the following steps: 1) treating process water, which is generated in the gluten concentration step in a wet-grinding technique for producing corn starch, to obtain a first permeation solution and a first trapped fluid containing rich com gluten meal; 2) filtering the first permeation solution through a hyperfiltration membrane with the molecular weight cut-off of 10-200 kDa under the conditions of 3-4 Bar and 35-45 DEG C to obtain a second permeation solution and a second trapped fluid containing rich soluble proteins; and 3) heating the second trapped fluid at 75-150 DEG C for 0.3 second-31 minutes, coagulating to precipitate a first protein product, separating to obtain a first protein product and a separation liquid, and concentrating and drying the separation liquid to obtain a second protein product. The recovery technique overcomes the defect that the traditional technique only treats the insoluble com gluten meal in the process water generated by the gluten concentration step, can obtain the two protein products, and can enhance the yield of the com gluten meal.