A photocatalyst cellular component (100) and a photocatalytic purification apparatus (10) comprising the photocatalyst cellular component (100), a lateral shielding housing (200), an air ventilation inlet piping (300), and an air ventilation outlet piping (400). The photocatalyst cellular component (100) comprises a photocatalyst cellular component housing (120) and one or more photocatalyst cellular filter cores (110). The photocatalyst cellular filter cores (110) are constituted by multiple filter core basic units (111) in a cellular arrangement. The end view of each filter core basic unit (111) is either a polygon or a circle. A photocatalyst coating (113) is attached to either a portion or the entirety of the polygonal or circular inner surface of each filter core basic unit (111). The areas encircled by the polygonal or circular inner surfaces of the filter core basic units (111) form polygonal or circular air channels (112) for air to flow through. The photocatalyst cellular component increases a contact area between polluted air and a photocatalyst, ensures that a sufficient amount of light is shone onto the surface of the photocatalyst, and, at the same time, allows the flow resistance applied to flowing air to satisfy the requirements of the field of ventilations systems having increased requirements on flow resistance.Linvention concerne un composant cellulaire de photocatalyseur (100) et un appareil de purification photocatalytique (10) comprenant ledit composant cellulaire de photocatalyseur (100), un boîtier de protection latérale (200), une conduite dadmission daération (300), et une conduite dévacuation daération (400). Le composant cellulaire de photocatalyseur (100) comprend un boîtier de composant cellulaire de photocatalyseur (120) et un ou plusieurs noyaux de filtre cellulaire de photocatalyseur (110). Les noyaux de filtre cellulaire de photocatalyseur (110) sont constitués de multiples unités de base de noyau de filtre (111) en un agencement cel
