The present invention relates to a loose material baking shaft kiln with an arched beam. The loose material baking shaft kiln comprises a kiln body (6), an arched beam and a hot gas flow guiding device, wherein the arched beam is supported and fixed inside the kiln body (6), the kiln body (6) is provided with a hole corresponding to the arched beam end surface, the lower portion of the arched beam and the inner wall of the kiln body (6) enclose to form a combustion chamber, a combustion nozzle is arranged inside the combustion chamber, the hot gas flow guiding device comprises a gas suction beam, a diversion device and a power device (7), the diversion device is connected to the gas suction beam and the power device (7), the power device (7) and the diversion device are positioned on the outer side of the kiln body (6), high-temperature gas inside the kiln body (6) enters the gas suction beam, and the power device (7) guides the high-temperature gas inside the gas suction beam device into the kiln body (6). With the loose material baking shaft kiln of the present invention, the treatment efficiency of the loose material baking shaft kiln is substantially improved; the arched beam end surface is exposed directly, such that the heat dissipation is quick, the cooling device is not required to be additionally arranged, and the cost is saved; and the whole cross-section of the kiln body can be effectively used so as to improve the production capacity of the kiln body.