An invisible sliding door trim structure includes a luggage trim provided at one side of a vehicle body opening part opened or closed by a door and including a reception space extended in a horizontal direction, a sliding trim provided at an inner side of the door and slid along the reception space of the luggage trim according to an opening or closing operation of the door, and a rotating trim provided to be rotatable with respect to the sliding trim according to the opening or closing operation of the door. Therefore, an invisible sliding door trim is capable of improving an appearance and overcoming a design restriction problem of a sliding door according to the prior art.