Photovoltaic roof connecting waterproof structure

The invention relates to the field of photovoltaic accessories, in particular to a photovoltaic roof connecting waterproof structure which comprises a roof, an underframe fixing plate is fixed to the upper portion of the roof through screws, a first fixing block is arranged on the upper portion of the underframe fixing plate, and the first fixing block is connected with a second fixing block through a movable rod shaft. A V-shaped groove is formed in the upper side of the second fixing block, a first fixing frame is arranged on the upper side of the V-shaped groove, a flow guide groove is formed in the lower side of the first fixing frame, the flow guide groove is in a V shape, and S-shaped elastic grooves are formed in the two sides of the flow guide groove. When the photovoltaic panel expands with heat and contracts with cold for a long time, the fixing frame deforms and tilts to cause a gap to be formed in the connecting position, the tilting part jacks the extrusion plate upwards through the supporting bl