The main target of this study is to synthesize one kind of granular cold‐water‐soluble (GCWS) starch by grafting poly(ethylene glycol) (PEG) segments onto the surface of native starch granules. It is found that the grafting process could introduce long PEG chains onto the granule surface, resulting in the presence of special micropits on the granule surface, as characterized by SEM. The cold water solution test verified that the resultant PEG‐grafted corn starches exhibited excellent cold‐water‐solubility. The XRD analysis and further polar optical micrograph (POM) observation indicated that the crystallites structure inside the PEG‐grafted corn starches was fully preserved, since no gelatinization process was involved. The present study provides a new train of thought that we can adjust the physiochemical properties of starch granules with proper surface modification.