The invention relates to a hermetia illucens larva-residue separating device. The device comprises a feeding device, a loading device and a separation device, wherein the feeding device comprises a feeding cylinder; an inlet and an outlet are formed in the feeding cylinder; the loading device is positioned under the outlet; the separation device comprises an annular insect material deposit area base plate; a separation dam which is raised upward is arranged on the inner ring of the insect material deposit area base plate; a peripheral baffle is arranged on the outer circle of the insect material deposit area base plate; an insect material deposit area is formed by the groove between the separating dam and the peripheral baffle; a heat device is arranged on the insect material deposit area base plate; the separating dam is made of an insulating material; an insect inlet is formed in the center of the separating dam and is communicated with a larva collection port which is arranged under the insect inlet. According to the device, the insulating separating dam is designed by utilizing the fleeing property of larvae at a relatively high temperature, insects are heated in the insect material deposit area and then are turned out from the insect material over the separating dam, and enter the larva collection port from the insect inlet in the middle of the separating dam, so that larvae are effectively separated from the insect material.