The invention relates to a connecting structure for polymer panels and a polymer panel roof using the structure. The roof comprises a plurality of connected polymer panels and a framework supporting the panels, an expansion gap is arranged between neighboring panels, and elastic sealing components are arranged in the expansion gaps; moreover, the neighboring edges of the panels are provided with slots; first metal attached frames are connected in the slots, and are mounted on the framework through connecting components; each first metal attached frame comprises a main body, a first folded edge and a second folded edge, and the first folded edge and the second folded edge are extended outwards from the main body; a first slot is formed between the first folded edge and the second folded edge; the first folded edge is inserted in the slot, and the lower panel body of the slot is inserted in the first slot. The invention avoids the defects of bolt connection, and has the advantages of hidden connection and reasonable structure. The first metal attached frames are prevented from moving vertically, consequently, the leftward and rightward motion of the first metal attached frames cannot be affected, and the first metal attached frames can move as the polymer panels are extended and retracted.