Roof panel transverse expansion joint connection node

Roof purlines are arranged on a pair of roof beams, purline supporting plates are arranged between the roof purlines and the roof beams, telescopic gaps are reserved between the opposite ends of the pair of roof purlines, roof inner plates are arranged on the lower surfaces of the roof purlines, heat preservation layers are arranged on the upper surfaces of the roof purlines, and roof outer plates are arranged on the heat preservation layers. Outer plate supports are arranged between the wave crests of the roof outer plates and the roof purlines, a pair of Z-shaped folding pieces is arranged on the upper surfaces of the opposite ends of the pair of roof purlines close to the edges, the tail ends of horizontal plates at the lower ends of the pair of Z-shaped folding pieces are oppositely arranged, and the horizontal plates at the lower ends of the Z-shaped folding pieces are fixedly arranged on the roof purlines through screws. A flashing plate is arranged between the upper ends of the pair of Z-shaped folding