The invention provides a method for protecting central heating from massive leakage based on a large-diameter intelligent heat meter. A pipe section of the large-diameter intelligent heat meter is provided with a solenoid valve connected with a circuit board in a base meter of the large-diameter intelligent heat meter. The method comprises a step 1) of detecting flow or flow velocity or pressure of central heating in the pipe section through a flow meter or a flow velocity meter or a pressure meter placed in the base meter, and recording the maximum value and the minimum value; a step 2) of receiving, by a processor loaded on the circuit board, the flow or flow velocity or pressure coming from the flow meter or the flow velocity meter or the pressure meter, and judging whether the flow or flow velocity or pressure is normal according to the corresponding maximum value and minimum value which are recorded in the step 1); if the flow or flow velocity or pressure is normal, controlling, by the processor, the solenoid valve to be in a switched-on state, or else, controlling the solenoid valve to be in a switched-off state, and switching off a central heating channel. According to the method, collected parameters can be judged according to preset normal heating parameters, so that the problem of heating leakage in a fracture pipe is solved timely and effectively, and secondary disasters are avoided.