The invention discloses a normal-temperature regenerating agent for asphalt mixtures and a method for manufacturing the normal-temperature regenerating agent, and belongs to the field of asphalt. The normal-temperature regenerating agent for the asphalt mixtures mainly comprises, by weight, 5-7 parts of oil, 1-2 parts of stabilizers, 90-100 parts of rubber, 0.5-1 part of dispersing agents, 0.1-0.8 part of vulcanizing agents and 0.3-0.6 part of accelerators. The method for manufacturing the normal-temperature regenerating agent includes adding the oil, the stabilizers and the rubber into a prefabricated pyrolysis device and carrying out pyrolysis on the oil, the stabilizers and the rubber; stopping heating the pyrolysis device when the temperature of the pyrolysis device reaches 345-365 DEG C; keeping the temperature of the pyrolysis device unchanged for 2-4 hours under the condition of the temperature of 300-320 DEG C when the temperature of the pyrolysis device is reduced and reaches 300-320 DEG C, then naturally cooling the pyrolysis device, collecting evaporated gas and condensing the gas to obtain cooling liquid; mixing the cooling liquid, the dispersing agents, the accelerators and the vulcanizing agents with one another to obtain the normal-temperature regenerating agent. The normal-temperature regenerating agent and the method have the advantages that the normal-temperature regenerating agent is low in mixing temperature, accordingly, energy consumption can be reduced, and preparation processes can be simplified.