The invention relates to a security system and in particular to an intelligent security system. The intelligent security system comprises a control module, a human body detecting module, a mobile phone terminal module, an alarm module, a lighting module, a camera module, a GPS module, a sensor module and a human body infrared detecting module, wherein the signal input ends of the control module are connected with the signal output ends of the human body detecting module, the GPS module, the sensor module and the human body infrared detecting module respectively; the signal output end of the control module is connected to the signal input ends of the mobile phone terminal module, the alarm module, the lighting module and the camera module. By means of the communication connection between the human body detecting module and the control module and between the human body infrared detecting module and the control module, the intelligent security system can control the working states of thecamera module and the lighting module, greatly saves energy, is simple in structure and high in intellectualized degree, and saves time and effort.