The invention belongs to the technical field of compound fertilizer production, and relates to a seaweed composition containing specific fertilizer for fruit trees and a preparation method thereof. The specific fertilizer is prepared by reasonably proportioning weathered coal, sulfuric acid, gasified ammonia, monoammonium phosphate, urea, potassium chloride, seaweed extract, zinc sulfate and borax, and granulating the obtained mixture by using a special process. The specific fertilizer is rich in organic matters and various trace elements, and has the characteristics of high utilization rate of fertilizer efficiency, long duration of fertilizer efficiency, and capability of facilitating the improvement of soil.