The invention discloses a dry-method hollow straight-barrel rotary kiln. The dry-method hollow straight-barrel rotary kiln comprises a rotary kiln chamber, wherein the thickness of refractory bricks of the inner walls of a preheating chamber and a drying chamber of the rotary kiln chamber is 2/3 of the thickness of refractory bricks of the inner walls of a cooling chamber, a sintering chamber anda decomposition chamber. Compared with the prior art, according to the dry-method hollow straight-barrel rotary kiln disclosed by the invention, the usage quantity of the refractory bricks in the rotary kiln can be reduced, so that the one-time investment is saved; the effective inner space of the drying chamber and the preheating chamber in the rotary kiln can be increased, and the flowing speedof hot air is reduced, so that heat exchange between materials and the hot air can be better completed, and the heat efficiency of a rotary furnace is increased; the overall weight of the rotary kilncan be reduced, so that the operating electricity charge is reduced; and a stop ring can be further formed, and material filling in the rotary kiln is improved, that is, the influence of the installation inclination of the rotary kiln on the material filling is eliminated, so that a better and more stable thermal regulation in the whole rotary kiln is achieved.