The invention discloses a hidden automobile charging port structure, which comprises a charging port base, a hidden face, a charging port face, a charging port cover support and a charging port cover,wherein the charging port cover is installed on the charging port cover support, the charging port cover support is arranged on the front face of the charging port base, a charging port is formed inthe middle of the charging port face, and driving spaces are arranged on the two side faces of the charging port base; a rack, a guide rail, a sliding groove, a driving gear and a transmission gear are arranged in the driving space, the guide rail is located at the position corresponding to the lower end of the front face of the charging port base, the sliding groove is located at the position corresponding to the hidden face, the rack is meshed with the guide rail, and a connecting rod is installed at the top of the rack and penetrates through the sliding groove and the other end of the connecting rod is connected with the top of the charging port cover support; a motor is arranged on the side face of the charging port base; and the motor is connected with a driving gear. The motor drivesthe gear, the gear drives the rack to move, and the rack drives the charging port cover to move, so that the motor drives the charging port to open and close, and the charging port cover is preventedfrom being opened manually.