The invention discloses a wind tunnel test putting device and a put object model design method thereof. The device comprises a putting hanging frame, which is fixedly provided with a spring, wherein one end of the spring is connected with a model hook, a hook rotating shaft is fixedly arranged on the putting hanging frame, and the model hook is rotationally connected with the hook rotating shaft; a T-shaped inclined joint, which is provided with a T-shaped inclined joint rotating shaft, wherein the T-shaped inclined joint is connected with the model hook through the T-shaped inclined joint rotating shaft; a connector lug I, which is connected to the end part of the T-shaped inclined joint, wherein the end part of the connector lug I is connected with a constantan wire; a connector lug II, wherein the constantan wire is connected between the connector lug I and the connector lug II, and the connector lug II is connected with a cross-shaped connecting block; a sliding block, which is arranged on the putting hanging frame in a sliding manner; a distance adjusting screw, which is connected with the sliding block, wherein the connector lug I and the connector lug II are connected with a power lead; and a putting object model, which is hung on the model hook. According to the invention, the putting of an external store model in a wind tunnel putting test is rapidly, efficiently and stably realized, and the efficiency of the wind tunnel test is improved.