The invention discloses environment-friendly and stable asphalt mixture modifier for melting snow. The modifier comprises the following components in part by weight: 60 to 90 parts of porous material, 10 to 40 parts of animal and vegetable oil and 0.1 to 5 parts of inorganic salt. The invention further discloses a preparation method of the environment-friendly and stable asphalt mixture modifier for melting the snow. The modifier provided by the invention has the advantages of stable composition performance of the components, economy, environmental friendliness, simple preparation process and preparation equipment, and stable and efficient use performance, and realizes scientific, reasonable and effective recovery and reuse of waste resources.