The invention discloses a processing method of an adult turtle floating puffed compound feed which sequentially comprises the following steps of: uniformly mixing raw materials for the first time; performing superfine grinding; adding trace additives, uniformly mixing the raw materials for the second time; regulating the quantity; extruding and granulating; baking; spraying grease; and cooling. The adult turtle floating puffed compound feed processed by the method has low requirement on raw materials, has the advantages of wide raw material sources, low price, comprehensive and balanced nutrition, high digestive absorption rate, high stability in water, low waste, light water pollution, good disease prevention effect and low incidence of diseases, and the effects of convenience in management, time saving and labor saving are achieved. The adult turtle floating puffed compound feed has good compliance; compared with compound powdery feed, the adult turtle floating puffed compound feed has the same effect in terms of feed intake and growing speed, has the advantages of better uniformity in growth specification, lower feed coefficient, higher breeding survival rate, so the feed can completely replace the conventional powdery compound feed, and can be used for breeding adult turtle in an outdoor pond.