The invention discloses a material dragging type quantitative feed machine material blending device and a mounting and debugging method of the material dragging type quantitative feed machine materialblending device and relates to the technical field of coal blending. The material dragging type quantitative feed machine material blending device comprises a belt conveyer frame. A tail pulley roller is arranged on the right side of the belt conveyer frame. The left side of the belt conveyer frame is provided with a drive roller. The tail pulley roller and the drive roller are in transmission connection through a belt. The tail pulley roller is provided with a belt tightening and adjusting device and a bolt tightening device which are matched with the belt. The right side of the bottom of the belt machine frame is provided with an automatic belt tightening and deviation-correcting device which is matched with the belt. By the adoption of the material dragging type quantitative feed machine material blending device and the mounting and debugging method of the material dragging type quantitative feed machine material blending device, an original subtraction difference control type feedcontrolling manner is abandoned, a material dragging type quantitative feed machine is adopted for independent metering, so that system error is greatly reduced, and the accuracy and stability of anautomatic coal blending system are greatly improved; and meanwhile the material dragging type quantitative feed machine material blending device can accurately weigh small-flow blending.