The embodiment of the invention provides an intelligent building heat supply control system comprising a collecting unit, a monitoring unit and a PLC unit. The collecting unit is used for collecting data and sending the data to the PLC unit. The collected data comprise temperature and flow. The PLC unit is used for sending the data collected by the collecting unit to the monitoring unit and receives valve opening and closing instructions sent by the monitoring unit. The monitoring unit is used for receiving the collected data, determining the opening time and the closing time of a heat supply valve according to the collected data and sending the valve opening and closing instructions to the PLC unit according to the opening time and closing time of the valve. The valve opening and closing instructions comprise opening/closing of the valve, and therefore the valve can be opened or closed according to the instructions. By the adoption of the intelligent building heat supply control system, energy-saving heat supply to a building is achieved, and the efficiency and the thermal comfort of the heat supply unit are improved.