The invention relates to a porous pavement paving device for mounting a longitudinal tile structure, and a paving method. The paving device comprises a frame with the cross section adopting a rectangular structure, wherein the inner side width of the frame is matched with the outer side width of the longitudinal tile; a plurality of groups of clamping grooves which are corresponding mutually and matched with the thickness of the longitudinal tile are arranged on the inner sides of the two longer borders of the frame; a first connecting hole and a second connecting hole which are convex or concave toward the same direction are respectively formed in the two shorter borders of the frame; the outwards convex first connecting hole is buckled and matched with the inwards concave second connecting hole in size. Through the adoption of the paving device, conventional materials such as tile and fine sand can be used to collect rainwater on the pavement; furthermore, the porous pavement paving device can be combined with an underground layered porous and collecting structure to complete collection or infiltration of the rainwater.