The invention discloses a mixed type surface plasmon optical waveguide with low transmission loss and stronger light field limiting capability; the cross section of the waveguide structure comprises a meal layer (1) embedded inside a medium (2) with low refractive index as well as two medium areas (3 and 4) which have high refractive index and are respectively positioned at the upper and the lower sides of the meal layer. As the medium areas which have high refractive index and are close to the meal layer are arranged, the light field distribution range of the waveguide structure can be obviously reduced, and two-dimensional sub-wavelength restrain of transmission light field can be realized; meanwhile, the lower transmission loss can be still maintained. The optical waveguide structure overcomes the contradiction between the light field limitation capability and transmission loss of the existing surface plasmon optical waveguide, and solves the problems of loss and interference in the surface plasmon optical waveguide devices with large size and high integration level, thus providing possibility for an optical waveguide chip with superhigh integration level.