The invention relates to the technical field of bituminous mixtures, in particular to a bituminous mixture relieving the urban heat island effect and a preparing method thereof.According to nano-glass modified bitumen and the bituminous mixture prepared from the nano-glass modified bitumen, waste glass serves as a raw material to be prepared into the nano-glass, the nano-glass is added into matrix bitumen to modify the matrix bitumen so that the matrix bitumen can have the characters of preserving heat, insulating heat and reducing the heat absorption capacity of road surfaces, the modified matrix bitumen and reasonable gradation aggregate are mixed into the bituminous mixture, and the spalling resistance of the bituminous mixture is improved through slaked lime.The pavement performance stability of the bituminous mixture is guaranteed while the performance of heat resistance and heat insulation of the nano-glass bituminous mixture is improved, the nano-glass bituminous mixture can reduce the heat absorption capacity of the road surfaces and reduce heat transmitted downwards in summer, the nano-glass bituminous mixture can keep the temperature of the road surfaces and reduce the heat energy consumption in winter, and therefore the purpose of reducing the bulk temperature of the bituminous pavement is achieved; the problem of waste glass waste disposal can be solved, and the heat insulation and heat preservation performance of the bituminous mixture can be performed to relieve the urban heat island effect.