The invention discloses a roasting device applicable to granular tea for brewing. The roasting device comprises a cylinder, a rack, a cover body, a stir-frying mechanism and a liquid inlet pipe, wherein the cylinder is horizontal, and a heating device is arranged in the cylinder; the rack is arranged below the cylinder; the stir-frying mechanism is arranged in the middle of the cover body and comprises a spindle, a spiral disc and a motor, the spindle penetrates through the middle of the cover body and is arranged in the axial direction of the cylinder, the disc is arranged on the spindle, the diameter of the disc is reduced gradually from the middle of the spindle to two sides, and the motor is connected with the spindle through a first connector and drives the spindle to rotate; the liquid inlet pipe is arranged at the upper part of the cylinder, penetrates into the cylinder from one side of the cylinder and extends to the other side of the cylinder, a plurality of through holes are formed in the liquid inlet pipe, and a control valve is arranged at a part, located outside the cylinder, of the liquid inlet pipe. According to the roasting device, materials are heated more uniformly, cylinder rotation is not needed, and more power is saved than a cylinder rotation mode.