The invention relates to an organic composite snow-melting agent and a preparation method thereof. The organic composite snow-melting agent is characterized by being prepared from the following raw materials in parts by weight: 0.5-5 parts of glycol, 0.1-5 parts of snow-melting accelerating agent and 30-50 parts of water, wherein the snow-melting accelerating agent is phycocyanin or fucoidin. In the invention, by adding the snow-melting accelerating agent to solution containing the glycol, the snow-melting effect is strengthened. Compared with the traditional snow-melting agent prepared from the glycol, the organic composite snow-melting agent of the invention obtained by adding the snow-melting accelerating agent can reduce glycol content to reach the same snow-melting effect, thereby greatly saving production cost. Meanwhile, the organic composite snow-melting agent of the invention has better low-temperature frost resistance, smaller corrosivity, limited harm to plants and environmental protection.