The invention provides a PCCP pipeline broken wire detection method based on on-the-spot detection and numerical simulation, which relates to the technical field of broken wire detection, comprising the following steps: emitting electromagnetic wave signals to the pipeline and receiving echo signals corresponding to the electromagnetic wave signals; Determining the reflected position information and the first phase information of the echo signal; The reflection position information is input to a preset broken wire detection function to obtain a second picture of phase information; The detection function of broken wire is obtained based on the finite element analysis method, and the detection function is related to the conductivity of the soil in which the pipeline is located. Detecting thebroken wire position of the pipeline according to the first phase information and the second phase information; The preset broken wire detection data in the broken wire detection database is read, and the broken wire position is corrected based on the broken wire detection data, and the corrected broken wire position is obtained. The invention is helpful for improving the accuracy of the detection of the broken wire position.