The invention discloses a method for determining reasonable compacting temperature of a modified asphalt mixture, and belongs to the field of road engineering. The method comprises the following steps: using an impacting penetration test to simulate a compacting shear rate and carrying out a temperature changing equivalent shear strength test on the mixture with the degree of density in an initial compacting stage; and calculating the reasonable compacting temperature of the modified asphalt mixture from a reasonable compacting temperature range of a known matrix asphalt mixture according to an equal penetration depth-temperature relation. The method provided by the invention is quick to operate and simple to control the test conditions, the test period is greatly shortened, and the method has application and popularization values.