A method for evaluating comprehensive performance of tourmaline modified asphalt and optimizing proportion of tourmaline modified asphalt comprises the steps of selecting 16 technical indexes, such asthe penetration index, penetration, equivalent softening point, ductility (10 DEG C), equivalent brittle point, penetration aging ratio, softening point increment, ductility aging ratio, adhesion grade, emission reduction rate, oxygen index, NOx purification rate, HC purification rate, CO2 purification rate, CO removal rate, the material cost, etc., as the evaluation indexes, combining multi-factor test with efficacy coefficient, systematically analyzing the basic properties, environmental efficacy, economic benefit and comprehensive performance of low-carbon modified asphalt, so that the method is strong in practical operability and reliability, avoids the one-sided evaluation, and provides a new idea for the comprehensive performance evaluation of tourmaline modified asphalt.