Road frame with hidden seat tube clamp

The utility model relates to the technical field of bicycles, in particular to a highway frame with a hidden seat tube clamp, which comprises an upper tube, a vertical tube and a seat tube, the seat tube is slidably sleeved in the vertical tube, the upper tube is connected to the vertical tube, the upper tube is provided with an accommodating cavity, the accommodating cavity is communicated with a tube inner cavity of the vertical tube, and the upper tube is provided with a hidden seat tube clamp. A containing cavity is formed in the seat tube, a sliding piece, a pressing piece and a locking piece are installed in the containing cavity, the pressing piece is connected with the locking piece, the sliding piece abuts against the pressing piece, the faces, abutting against the sliding piece and the pressing piece, of the sliding piece and the pressing piece are matched inclined faces, and at least one of the sliding piece and the pressing piece abuts against the seat tube. According to the technical scheme, the