The invention discloses an 
ultraviolet space disinfection device, and particularly relates to the technical field of indoor disinfection and sterilization equipment. The 
ultraviolet space disinfection device comprises a disinfection box and an incident 
pipe, a connecting rod is welded to the inner wall of an inner cavity of the disinfection box, a refractor is fixedly installed at the other end of the connecting rod, a 
discharge pipe is fixedly connected to the bottom of the inner cavity of the disinfection box, a conversion base is welded to the bottom of the disinfection box, and a spraying 
pipe is fixedly connected to the side face of the conversion base. According to the 
ultraviolet space disinfection device, by arranging a 
refraction device, existing disinfection equipment irradiates air with one ultraviolet 
ray, so that the disinfection effect is achieved, but one ultraviolet 
ray cannot achieve the thorough disinfection effect, and when the 
refraction device enables the ultraviolet rays to enter the internal space of the disinfection device, multi-layer 
refraction of the ultraviolet rays is carried out, so that air is subjected to multi-layer disinfection, the problem of incomplete disinfection is avoided, the problem of harmful substance residues is solved, and it is guaranteed that harmful substances are thoroughly disinfected.