The invention relates to a method for forging 500-Kg-level GH3230 high-temperature alloy. According to the method, as the initial forging temperature is increased to 1200+/-10 DEG C, the problems that as the transferring time is excessively long, the initial forging temperature is excessively low, and the forging interval is reduced accordingly are solved, the crack possibility is greatly reduced due to the increasing of the initial forging temperature, and a follow-up damage repairing step is avoided; meanwhile, the forging interval between the initial forging temperature and the final forging temperature is increased by 180 DEG C to 210 DEG C; as the forging interval is increased, the one-time pressing amount is greatly increased, and the heating number is effectively decreased accordingly; meanwhile, as the end of a forge piece is wrapped by heat preservation cotton, the temperature of the end of the forge piece is lower than the temperature of the end which is not wrapped by the heat preservation cotton due to the heat insulation effect of the heat preservation cotton, the time when the end, wrapped by the heat preservation cotton, of the forge piece is in the high temperature state is short accordingly, and the problem that as the end of the forge piece is not deformed, grains are thick and large can be solved.