The present invention relates to a hypromellose hollow capsule and a preparation method thereof. The method comprises the following steps: firstly hypromellose, peach gum, maltose powder and zinc chloride are dissolved in deionized water at normal temperature to obtain a dispersion solution; after the dispersion solution is subjected to microwave heating to 80-100 DEG C, heat preservation, then cooling, heat preservation, microwave heating to 50-60 DEG C again, stirring, heat preservation, cooling to 25-30 DEG C, stirring and heat preservation are conducted to obtain a stable first colloidalsolution; the peach gum, maltose powder and zinc chloride are taken to be dissolved in deionized water at a temperature of 70-80 DEG C, and after the materials are completely dissolved, cooling is conducted to obtain a second solution; a capsule mold is soaked in the second solution for a certain time, the soaked capsule mold is taken out, and the taken out capsule mold dips a capsule base of thecapsule prepared by the first colloidal solution; and after the capsule base is dried, demolding, cutting and sleeving are sequentially conducted to prepare the hypromellose hollow capsule. The methodimproves stability of the colloidal solution and is beneficial to improving stability of the capsule obtained by molding the colloidal solution.