The present disclosure relates to the field of display technology. Provided are a photo alignment device and a photo-alignment method. The photo alignment device comprises a worktable; at least two light source modules arranged along a first direction; at least two light-shielding modules arranged along the first direction; and at least two light-polarizing modules arranged along the first direction, wherein the light-polarizing modules at least comprises a first light-polarizing module and a second light-polarizing module whose light-polarizing directions are different, the light-shielding modules comprise at least two light-shielding plates that are movable, the light source modules, the light-polarizing modules and the light-shielding modules are able to form a plurality of working modules, and one of the working modules comprises one of the light-polarizing modules, one of the light source modules and one of the light-shielding module The photo-alignment device can improve the efficiency of manufacturing photo alignment films.