The invention discloses an intelligent building control system which comprises the components of a central monitoring system, an entrance guard subsystem, an air conditioning subsystem, an elevator self-control subsystem, an illuminating subsystem, a power transforming and distributing subsystem, a water supplying and drainage subsystem, a fire automatic alarm subsystem, a security subsystem, a television monitoring subsystem, an automatic meter reading subsystem, a garage management subsystem, a consuming subsystem, an attendance checking subsystem, a water pipe water-leakage automatic detecting subsystem, an electronic patrol subsystem, an environment monitoring subsystem and a power supply system; wherein the entrance guard subsystem, the air conditioning subsystem, the elevator self-control subsystem, the illuminating subsystem, the power transforming and distributing subsystem, the water supplying and drainage subsystem, the fire automatic alarm subsystem, the security subsystem, the television monitoring subsystem, the automatic meter reading subsystem, the garage management subsystem, the consuming subsystem, the attendance checking subsystem, the water pipe water-leakage automatic detecting subsystem, the electronic patrol subsystem, the environment monitoring subsystem and the power supply system are connected with the central monitoring system. The central monitoring system comprises a central server, a display device, an alarm device, a central database and a GPRS terminal, wherein the display device, the alarm device, the central database and the GPRS terminal are electrically connected with the central server. Furthermore the subsystems are in communication connection with the central server through Ethernet. The water leakage detecting unit of the water pipe water-leakage automatic detecting subsystem is a water battery. The intelligent building control system has advantages of advanced technique, high economical performance, high practicability, high safety, high reliability, high quality, etc.