The invention provides an ecological bank revetment soil curing agent and a preparation method and application thereof. The curing agent is at least prepared from the following ingredients in parts by weight: 20 to 35 parts of cement, 45 to 65 parts of coal ash, 6 to 15 parts of anhydrite, 3 to 5 parts of alkali-activators and 2 to 6 parts of organic fertilizers. The curing agent is mainly used for protecting a bank; the growth of plants on the bank cannot be obstructed; durability and firmness are realized.