The invention discloses a flotation enriching method for willemite. According to the method, sodium hexametaphosphate and tannin extract are taken as gangue mineral inhibitors, lime and salicylaldoxime are taken as willemite activating agents, and lauryl sodium sulfate and lauryl mercaptan are taken as willemite collecting agents. Due to the adoption of the flotation enriching method, willemite minerals can be effectively floated and enriched. After one time of rougher flotation, four times of scavenging and three times of concentration are performed under the condition that the feed zinc content is 8.78-15.66 percent, zinc silicate concentrate of which the zinc content is 45.67-46.74 percent and the recovery rate is 83.15-85.61 percent is obtained.