The invention discloses a heat treatment technique for an aluminum sleeve of a balance shaft. The heat treatment technique comprises the steps that (1) aging treatment is conducted, and specifically the aluminum sleeve of the balance shaft is treated for 4-24 hours in a constant-temperature furnace at the temperature of 190-230 DEG C; and (2) cooling treatment is conducted, specifically the aluminum sleeve, subjected to aging treatment, of the balance shaft is cooled for 20-48 hours under the indoor temperature condition. Meanwhile, preheated air is introduced into a heat treatment furnace during aging treatment, so that the temperature difference in the heat treatment furnace is decreased, and the effect that the quality of the aluminum sleeve of the balance shaft is uniform before heat treatment and after heat treatment is guaranteed. By the adoption of the heat treatment technique, internal stress, caused by casting stress, of the aluminum sleeve of the balance shaft can be eliminated, the appearance and dimension of a machined part are stabilized, the probability that the aluminum sleeve of the balance shaft expands due to heating in the use process is lowered, and the after-sale repair difficulty is lowered.