The utility model relates to a groove-shaped closed curve circulation roasting furnace. The utility model is characterized in that a hearth path is composed of a groove-shaped closed curve and an upper cover which is provided with flue holes; the hearth path is long, so more than one flue hole needs be arranged; movable clapboards are arranged between adjacent flue holes, a heat insulation layer is arranged outside the hearth path, and an exhaust blower is used and put on each of suction openings to suck wind by turns. Via the variety of the wind power and the installation position of the blower, temperature in the furnace and the preheating time and the roasting time and the heat insulation time of reaction are effectively regulated, and thus, roasting temperature is reached; via utilizing an exothermic reaction in the process of roasting, and one-time ignition and continuous circulation production are realized; smoke is cleaned and processed by steam through a subsequent hearth path, the smoke is filtered through gaps among subsequent blank materials, and thus, dust is removed, so the purpose of controlling discharge is achieved; the requirement of environmental protection is satisfied, and environment is not polluted.