The invention discloses an intelligent community security and protection system based on big data. The system comprises a visitor registration module, a face recognition module, a user terminal, a video acquisition module, an alarm module, a temporary storage module, an abnormity analysis module, an access control module, a radio frequency recognition module, an active infrared intrusion detector,a local database, a temporary access module, a data processing module, a display module and a controller. According to the system, the face image information of a temporary visitor is recorded in advance, so that the temporary visitor can freely enter and exit from the community within the set time. A resident is prevented from going downstairs for reception or going through a tedious registration procedure, the detection process is greatly shortened, and the access of a person without a card is facilitated. Meanwhile, the monitoring time is divided into a plurality of continuous and equal time periods, and the person activity condition of a monitored area of a community in the time period with the small people flow density is analyzed, so that the abnormal conditions of suspected tumbling, stealing, fighting and the like are found in time.