The invention relates to an acquisition method of a transient temperature rise between two cables containing a time delay switch. The method comprises the following steps: 1) constructing a thermal circuit model of mutual response between the cables containing the time delay switch; 2) acquiring a calculation model of the transient temperature rise between the two cables, which contain the time delay switch, according to the thermal circuit model of mutual response between the cables containing the time delay switch, and determining parameter values in the calculation model of the transient temperature rise between the two cables containing the time delay switch; and 3) adopting the calculation model of the transient temperature rise between the two cables, which contain the time delay switch, to acquire the transient temperature rise between the two cables. Compared with the prior art, the method has the advantages of innovativeness, fast calculation, simple and accurate calculation and the like.