The invention discloses a user group positioning method and a server. The method comprises the following steps: selecting at least one candidate user conforming to a preset target feature as a seed user based on data of services used by candidate users; determining member users of at least one user group to which the seed users belong, and at least one property owned by the member users; comparing at least one property owned by each member user in the user groups, determining common properties of the user groups, and setting the common properties of the user groups to each member user of the user groups; and selecting user groups having target common properties based on the common properties corresponding to the at least one user group, and screening the member users of the user groups having the target common properties to obtain target user groups.