The invention discloses a steam cleaning device. The steam cleaning device comprises a body and a sealing ring, wherein the body comprises a bottom and a top; a steam cavity which penetrates through the bottom and the top is arranged in the body; and the bottom is equipped with an opening which communicates with the steam cavity for releasing steam. The sealing ring surrounds the bottom, and the sealing ring comprises a top wall and a plurality of sealing teeth which are arranged in a spaced mode, wherein every two adjacent two sealing teeth and the top wall define a steam expanding cavity. According to the steam cleaning device disclosed by the invention, a maze sealing structure is additionally arranged at the periphery of the body, so that the sealing performance is better, steam overflow is reduced, and the temperature, on a to-be-cleaned surface, of the steam action is increased when the steam cleaning device is in contact with the to-be-cleaned surface. The steam cavity is arranged, so that steam is uniformly diffused in the cavity, and temperature distribution on the to-be-cleaned surface is uniform, and therefore, the effective heating area is increased, the cleaning effect is improved, and the user experience is improved.