The invention discloses an acousto-optic switch apparatus. The acousto-optic switch device comprises a drive power, an acousto-optic device and at least one parallel prism, wherein the acousto-optic device comprises an impedance matching network, an electro-acoustic transducer and an acousto-optic medium; the drive power drives the acousto-optic medium to form a refractive index grating; the parallel prism is arranged on one side of the acousto-optic medium and is certain distance away from the acousto-optic medium; light comes at a certain angle to the refractive index grating to form a level one diffracted light and a level zero light which respectively reach different positions of the parallel prism, the level one diffracted light is output from a first port of the parallel prism, the level zero light is output from a second port of the parallel prism, and the first port and the second port are spaced from each other and are positioned at the same side of the parallel prism. The coupling and outputting of the level one diffracted light and the level zero light in the same direction are realized, and thus, the structure of the apparatus is compact, and the system can be easily integrated.