Building material feeding machine

The invention discloses a building material feeding machine. The machine comprises a bottom plate, an L-shaped plate is fixedly installed at one side of the top end of the bottom plate, a rotating rodis rotatably connected to the position, located below a transverse plate of the L-shaped plate, of the top end of the bottom plate, the top end of the rotating rod penetrates through the transverse plate of the L-shaped plate and extends to the position above the L-shaped plate, and a transverse rod is fixedly installed at the upper portion of the rotating rod; and a rotation rod is rotatably connected to the end, away from the rotating rod, of a supporting rod, a rotation block is rotatably connected to the end, away from the transverse rod, of the rotation rod, and a hopper is fixedly mounted at the end, away from the rotation rod, of the rotation block. By arranging the rotating rod, the rotation rod and other elements, the hopper can be driven to ascend and descend through a hydraulicair cylinder, the machine