The invention relates to a full-ecological feeding device for lepidopteran pests in a small laboratory. The full-ecological feeding device comprises a feeding box, wherein the feeding box comprises afeeding cavity, a feeding port is formed in a front side plate of the feeding cavity, a bottom plate is arranged at the bottom of the feeding cavity, a through hole is formed in the bottom plate, a feeding filter screen is arranged above the through hole, grid baffles are arranged around the feeding filter screen, connecting rods are arranged for the grid baffles on the left side and the right side of the feeding filter screen, a feed plate is arranged at the tops of the two connecting rods, a plurality of hook holes are formed in the feed plate, and S-shaped hooks are arranged in the hook holes; a top plate of the feeding cavity is provided with an upper ventilation opening, the two sides of the feeding cavity are provided with side ventilation openings, the right side of the top plate ofthe feeding cavity is provided with a fixing rod, the fixing rod is hinged to an adjusting rod, the adjusting rod is hinged to a camera, and the left side of the feeding cavity is communicated with atemperature measuring cavity; the temperature measuring cavity is provided with a temperature detector, a cleaning cavity is arranged below the bottom plate of the feeding cavity, the right side of the cleaning cavity is opened, the cleaning cavity is slidingly connected with a cleaning drawer, a recording plate is arranged at the bottom of the front side of the feeding box, and a label groove and a recording paper groove are formed in the recording plate. The full-ecological breeding and observation of lepidopteran pests are realized.