i want use ue4 to mobile game, then i need to know the scene face and drawcall that mobile can bear.

i will use ue4 to create a mobile game, android or ios , but i dont know how much the scene faces and drawcall that it can dear.
if i get these datas, i can optimize my scene, and to improve game efficiency, rendering.

It depends entirely on your target hardware and shader complexity. Epic recommends < 500k poly and < 700 draw calls to reach 30 fps an an iPad 4 / Air, as mentioned here: