The invention relates to rupatadine fumarate eye drops. The eye drops are prepared from rupatadine fumarate serving as a primary medicament, and a thickening agent, buffer salt, an isotonic agent, a bacteriostatic agent and a solubilizer serving as auxiliary materials. A preparation method A comprises the following steps of: dissolving the thickening agent by using a certain amount of water, and dissolving the primary medicament, the buffer salt, the isotonic agent, the bacteriostatic agent and the solubilizer by using a certain amount of water for injection; and mixing the two kinds of solution, and adding a proper amount of water for injection to reach the needed concentration. A preparation method B comprises the following steps of: stirring the thickening agent, the rupatadine fumarate, the buffer salt, the bacteriostatic agent, the isotonic agent, the solubilizer and the water for injection for a long time until the solution is clarified; and supplying the water for injection to fix the volume. The rupatadine fumarate eye drops have the advantages of simple preparation method and use for treating ocular surface allergic diseases, and have the characteristics of obvious curative effect, no irritation, no toxic or side effect, high stability and the like.