The invention discloses an environment-friendly garbage disposal device. The environment-friendly garbage disposal device comprises a disposal device body and a chimney, and the chimney is arranged onone side of the top end of the disposal device body; a supporting plate is arranged in the disposal device body and partitions the disposal device body into a combusting chamber and a collecting chamber, and the combusting chamber is located at the top end of the collecting chamber; a fixing plate is arranged on one side of the interior of the combusting chamber, a first supporting column is arranged at the top end of the side, far away from the inner wall of the combusting chamber, of the fixing plate, a stand column is arranged at the top end of the first supporting column, a supporting base is arranged at the top end of the side, far away from the fixing plate, of the stand column, a sliding column is arranged on the side, far away from the stand column, of the supporting base, a cylinder is arranged on the side, far away from the supporting base, of the sliding column, and a groove matched with the sliding column is formed in the cylinder and formed in the mode of surrounding thecylinder; and a rotation shaft is arranged at the bottom end of the cylinder, a motor is arranged on one side of the top end of the interior of the disposal device body, a rotating shaft of the motoris rotatably connected with the rotation shaft, and the rotation shaft penetrates through the first supporting column and extends to the position under the first supporting column.