The invention provides a greening method for a discarded ion-type rare earth mining area, and relates to the field of the ecological remediation. The method comprises the following steps: performing the first greening treatment on a mine side slope by using herbaceous plants; and performing the second greening treatment on a riding track by using ligneous plants, wherein the second greening treatment comprises the following steps: reserving soil of the discarded ion-type rare earth mining area obtained by excavating plant pits; performing the first modified treatment on the soil of the discarded ion-type rare earth mining area obtained by excavating the plant pits, to obtain the improve soil; performing the second modified treatment on the soil of the discarded ion-type rare earth mining area in the plant pits, to obtain the modified plant pits; placing seedlings of the acidophilous plants (cedar, pine, tea, cherry bay, red bayberry, blueberry, navel orange, Camellia semiserrata and the like) in the modified plant pits, planting the seedlings of the ligneous plants by using the improve soil and acidic water; and performing the field management on the planted seedlings by using a dynamic remediation plantation management method, and realizing the vegetation restoration. The method is capable of not only recovering the vegetation growth in the damaged mining area, but also bringing the economic benefit. Used materials are easily obtained, the cost is low, and the method is simple and convenient.