The utility model provides an assembly type structure faces flat protection of edge water and chooses net, includes left A -frame and right A -frame, and left A -frame's the outside and right A -frame's the outside and steel pipe are connected fixedly, and left A -frame's inboard with right A -frame is connected by the rectangle steel pipe and is fixed, choose that prefabricated exterior wall board mounted position that the net corresponds is pre -buried to have a sleeve facing the flat protection of edge water, the couple seat is fixed on the sleeve through bolted connection, face in rectangle steel pipe that the flat protection of edge water chose the net embolias the couple of couple seat, close mesh safety net is peripheral to be connected and fixes on left and right A -frame and rectangle steel pipe, steel pipe. The utility model discloses simple structure, low cost, the installation is easy, and is safe, practical, reliable, can standardize manufacturing in batches to repeatedly usable is favorable to improving the work efficiency, reduces construction environmental pollution.