The invention discloses an environment-friendly flue gas waste heat drying device in the technical field of flue gas treatment. The environment-friendly flue gas waste heat drying device comprises a tank body, the inner side of the tank body is coated with a heat insulation coating, a draught fan is arranged on one side of the tank body, a drying box is arranged on the other side of the tank body,a filtering assembly is arranged in the tank body, the filtering assembly comprises air guide pipes, a vertical rod, fan blades, heat conduction wires, a discharging pipe, a filtering cylinder and asealing plate, an air duct is fixedly connected to the bottom end of the interior of the tank body, the air guide pipes are rotationally connected to the top of the air duct, and the fan blades are fixedly connected to the outer side of the vertical rod. According to the environment-friendly flue gas waste heat drying device, air can be heated through heat of the heat conduction wires and the tankbody, so that the heated air is conveyed into a heat preservation interlayer through a connecting pipe, heating and drying of objects are facilitated, the structure is beneficial to full and reasonable utilization of heat in exhausted flue gas, and therefore, the environment-friendly flue gas waste heat drying device is more energy-saving, environmentally friendly and high in practicability.