Windowsill coping concave ribbed precast block

The utility model relates to the technical field of windowsill coping, in particular to a windowsill coping concave type ribbed precast block which comprises a precast block body and a reinforcing steel bar consolidation frame, and balance assemblies are installed on the upper surface of the precast block body through four balance assembly installation grooves respectively. The lower surface of the precast block body is provided with placing assemblies through four placing assembly mounting grooves correspondingly, a plurality of reinforcing steel bar consolidation frames are arranged in the precast block body, and wall body extending reinforcing steel bars and window body extending reinforcing steel bars are fixed to the interior of the precast block body through the reinforcing steel bar consolidation frames correspondingly. When the wall bodies on the two sides of the window opening are built, the prefabricated blocks are directly adopted for the portions, anchored into the wall bodies, of the coping, conc