A fan bearing cup connection structure includes a bearing cup, a bottom board and a connection member. The bearing cup has a receiving space, a connected section and a shaft hole. The shaft hole is formed at a top end of the bearing cup in communication with the receiving space. The connected section is disposed on outer circumference of the other end of the bearing cup opposite to the shaft hole. The bottom board has an opening. The connected section of the bearing cup is disposed in the opening. The connection member is connected between the bearing cup and the bottom board by means of injection molding. By means of the connection member, the bearing cup and the bottom board can be more securely connected with each other to greatly enhance the concentricity of the bearing cup and the bottom board.