A focusing ion guiding apparatus includes at least one ion guiding inlet and ion guiding outlet connected to each other via a transport axial line; at least one group of focusing electrode structures comprising at least one smooth and non-concave focusing electrode or focusing electrode array to which a focusing voltage is applied, the focusing electrode structure causing the ions transported in the apparatus to be radially focused for many times under the action of a focusing electric field formed by the focusing electrode structure; and a neutral gas flow transported in the axial direction, a diffusion path of the gas flow in an at least partially radial direction relative to the axial direction being blocked by the focusing electrode or its bearing substrate to increase a transport velocity of the gas flow in the axial direction and reduce retention or turbulence of the transported ions.