The invention discloses a double dating method for single-particle monazite. The method includes the steps that the crystallization age, namely the occurrence time of a magmatic intrusion incident , of a granite geologic body where the monazite is located can be obtained; (U-Th)/He age of the monazite can be obtained and represents the uplift-related cooling age, namely the time of fast tectonic uplift of the geologic body. The intrusion history and the tectonic uplift history of the geologic body where the monazite is located can be obtained through U-Pb and (U-Th)/He double dating of the single monazite at the same time, and the double dating method is of important geological significance.