The invention discloses a method displaying an electromagnetic field of a converting station in three-dimensional and visual mode. The method displaying the electromagnetic field of the converting station in three-dimensional and visual mode comprises the following steps: S1, utilizing a three-dimensional laser scanner to perform three-dimensional live-action scanning modeling, and generating a converting station three-dimensional model; S2, connecting the converting station three-dimensional model with a power grid real-time running system to acquire real-time electromagnetic data of devices in the converting station; and S3, drawing a three-dimensional contour surface in the converting station three-dimensional model according to the real-time electromagnetic with data of the devices, and performing visual displaying by combining with the real-time electromagnetic with data of the devices. The converting station three-dimensional model is connected with the power grid real-time running system, an electromagnetic field three-dimensional contour surface is reconstructed in the converting station three-dimensional model, a great quantity of point data obtained by typical electromagnetic field calculation models in the converting station are converted into visual real-time interactive three-dimensional image information, conditions such as live-action environment, electromagnetic field distribution of the converting station are displayed comprehensively, and basis and assistance are provided for decision-making and control of converting station running.