The invention discloses an one-four-optional optical switch which comprises an input optical waveguide, an input collimator, a first prism, a second prism, an output collimator and four output optical waveguides, wherein the input optical waveguide, the input collimator and the output collimator are arranged in sequence in the horizontal direction; the four optical waveguides are placed behind the output collimator; the four output optical waveguides are arranged from top to bottom in sequence in the vertical direction; the input optical waveguide and the fourth optical waveguide are arranged on the same horizontal line; both the first prism and the second prism can move in and out between the input collimator and the output collimator; the first prism comprises a first vertical surface and a first inclined surface; the second prism comprises a second vertical surface and a second inclined surface; the inclination angle of the second inclined surface is greater than the first inclined surface. By adopting the one-four-optional optical switch, the function of one-four-option can be achieved in a single optical switch device, the size of the device can be reduced, and integral manufacturing can be facilitated.