The invention relates to a community access security protection method and system. The community access security protection method includes the steps: acquiring identity information of a user by means of two-dimensional codes; authenticating whether the identity information of the user is stored in a pre-built database or not; controlling a community door to open if the identity information of the user is stored in the pre-built database; returning authentication failure information if not. The user can enter or exit the community door only by carrying an intelligent mobile device without carrying an access card, user experience is improved, the manufacturing cost of the access card is reduced, and security of a community is enhanced.