1. A solid-filling coal mining feeding and conveying monitoring system, comprising: an industrial control computer, a PLC control box, an operating platform, a liquid crystal display, a color four-picture divider, two video optical receivers and loudspeaker boxes, a camera A, a camera B, a camera C, a camera D, an uphole electronic belt scale, a downhole electronic belt scale, a radar level meter, a coal level sensor, a vibration sensor and various matching junction boxes and cables, wherein: the operating platform, the liquid crystal display, the color four-picture divider, the video optical receivers and the loudspeaker boxes are all installed in a control room; the camera A is installed at an outlet of a stock ground; the camera B is installed above an uphole feeding port; the camera C is installed at an upper port of a storage silo; the camera D is installed in a gangue transportation lane; monitoring videos of all of the cameras are transmitted to the control room via cables; signals acquired in real time are displayed on the liquid crystal display; the uphole electronic belt scale is installed on a ground rubber belt conveyor; the downhole electronic belt scale is installed on a downhole rubber belt conveyor; the radar level meter and the coal level sensor are installed in the storage silo; and the vibration sensor is installed under a damping beam of a buffering device.