The invention discloses a continuous heat treatment device which aims at providing a continuous heat treatment device mainly focusing on powdery or small grain materials. The invention has the advantages of low energy consumption, high utilization rate of workshop resources, easiness in operation, utmost reduction of pollution, even temperature of heat treatment of materials, meeting the requirement of air isolation in heat treatment of materials without protective air, meeting the requirement for special atmosphere in heat treatment of materials, even atmosphere and low air consumption. The device comprises a feeding device, a blanking tube, a heating device and a discharge device; the feeding device, the heating device and the discharge device are respectively positioned at the upper part, the lateral side and the lower part of the blanking tube; the feeding pipe is vertically arranged; the heating device can continuously heat the blanking tube and materials in the tube; the feedingdevice can continuously feed materials to the blanking tube; the blanking tube helps the materials to move downwards along the blanking tube under self gravity; the discharge device can continuously discharge the materials in the blanking tube; the blanking tube includes an air inlet pipe and a gas distributing device; one end of the air inlet pipe is connected with the gas distributing device, and the other end is provided with an opening out of the blanking tube. The invention mainly focuses on heat treatment to powdery or small grain materials.