The invention relates to a quasi dynamic compatibilization method based on a cable heat transmission model, which is used for cable compatibilization inside a calandria. The method comprises the following steps: 1) according to the working condition of a total cable line, a data acquisition system is built in a bottleneck cable section, and data measurement on the day is carried out; 2) according to the data of the bottleneck cable section measured by the data acquisition system on the day, a cable heat transmission model of the bottleneck cable section on the next day is built and updated with the day as a unit; and 3) according to the cable heat transmission model of the bottleneck cable section on the next day, current-carrying capacity of the to-be-compatibilized cable on the next day in the bottleneck cable section is estimated for realizing cable compatibilization. Compared with the prior art, the method has the advantages of advanced method, good real-time performance and obvious benefits.