The invention provides a material taking device of plastic bucket. The material taking device of plastic bucket comprises a butt-joint device and a stream guidance pipe; the stream guidance pipe is fixedly connected with the center at the top of the butt-joint device; a piston is installed inside the stream guidance pipe; the piston is movably connected with the inner wall of the stream guidance pipe; the piston is provided with a connecting rod; the bottom end of the connecting rod is fixedly connected with the center of the piston; the top end of the connecting rod is fixedly connected with a handle; the inner wall of the butt-joint device is provided with threads; the top of the butt-joint device is provided with a material discharge device; the material discharge device is communicated with the butt-joint device; the discharge device is provided with a control panel; one side of the discharge device is provided with a discharge port; the discharge port is provided with a flowmeter; the flowmeter is communicated with the control panel; the center at the top of the discharge device is provided with a rubber pad which is provided with a hole; and the connecting rod passes through the hole of the rubber pad. The material taking device of plastic bucket has the advantages of simple in structure, simple in operation, saving time and labor, being able to quantify the material which is taken out, thus avoiding wastage of materials and preventing the bucket body from being polluted.