The invention relates to beneficiation and flotation technologies, in particular to application of hydroxyethyl starch ether to fluorite ore flotation. A flotation method for fluorite ores includes the following steps that the fluorite ores containing barite and calcite minerals are ground, fed into a flotation machine and stirred for pulp conditioning; then the pH of ore pulp is adjusted to be larger than or equal to 7 through HCl or NaOH or Na2CO3 and stirring is performed; hydroxyethyl starch ether inhibitor is added, the effect that the concentration of the inhibitor is 20-200 mg/L is ensured, and stirring is performed for two to five minutes; and finally, a collecting agent of sodium oleate is added with the use amount being 20-400 mg/L, and inflation and bubble scraping are performed. The hydroxyethyl starch ether has good ability to inhibit the barite and the calcite and has the advantages of environment friendliness, wide source, low price, obvious effects and the like.