The invention discloses a system used for expanding the combined heat and power generation centralized heating scale. The system comprises a plurality of steam boilers, a steam turbine generator unit,a numerical control voltage regulator, a boosting transformer, an electrical power monitoring and controlling line, a step-down transformer, a voltage detection module, a single chip microcomputer, an electromagnetic valve, a heat energy transmitting pipeline and an air pressure and temperature detection module. According to the system used for expanding the combined heat and power generation centralized heating scale, a plurality of independent generating sets in the prior art are connected together in parallel, transmitted heat energy and electric energy can be detected on the heat energy transmitting pipeline and an electric energy transmitting pipeline through the intelligent detection module, signals are processed through the single chip microcomputer, abnormal conditions happening in the electric energy and heat energy transmitting process can be handled in time, the single chip microcomputer can conduct coordinated handling on heat energy and electric energy by controlling thevoltage regulator and a control valve, and thus the transmitting stability and safety are guaranteed; and moreover, through the parallel generator method, production capacity is improved and losses are reduced.