The invention provides a medium/trace element granular fertilizer and belongs to the technical field of medium/trace element fertilizers. The medium/trace element granular fertilizer comprises the following raw materials in parts by weight: 70-92 parts of oyster shell powder, 5-10 parts of calcined oyster shell powder, 10-40 parts of magnesium sulfate monohydrate and 0.5-6 parts of an alga activesubstance. The medium/trace element granular fertilizer provided by the invention is comprehensive in medium/trace element type, good in effectiveness, capable of replenishing medium/trace elements carried away by crops from soil in time and comprehensively, and thus has good effects that a healthy environment is provided for crops to grow, the nutrition is balanced, the yield of crops is increased and the quality is improved. In addition, the oyster shell powder in the medium/trace element granular fertilizer provided by the invention is of a micro hole structure, microbial population structures of soil can be regulated, the number of beneficial bacteria can be increased, meanwhile, plant root systems can be developed, plants can grow strongly, the crop resistance can be improved, and theyield can be increased. In addition, together with a basic fertilizer, the medium/trace element granular fertilizer provided by the invention can be used in modes of bottom application and throwing,and is convenient to use.