Adjustable double-layer floor drain

The invention discloses an adjustable double-layer floor drain. The adjustable double-layer floor drain comprises an upper floor drain and a lower floor drain which are arranged up and down, wherein the lower floor drain comprises a lower cup body and a lower water pipe; the lower water pipe is arranged on the lower cup body in a penetrating manner in the direction of the center line of the lowercup body; a supporting block is arranged in the lower water pipe and is fixed to the lower water pipe through a lower supporting rod; the upper floor drain comprises an upper cup body and an upper water pipe; the upper water pipe is fixedly connected to the bottom of the upper cup body and is connected to the upper cup body; a supporting screw is arranged in the upper water pipe in the direction of the center line of the upper water pipe and is fixed to the upper water pipe through an upper supporting rod; the upper water pipe is inserted into the lower water pipe; the supporting screw passesthrough the supporting blo