A photocatalytic honeycomb assembly and a photocatalytic purification apparatus, which can maximally increase a contact area between polluted air and a photocatalyst while maximally ensuring that the surface of the photocatalyst receives sufficient irradiation of ultraviolet light, and can also make the flow resistance to air flowing in a channel meet requirements in the field of ventilation systems which have high requirements on flow resistance. The photocatalytic honeycomb assembly is formed of one or more photocatalytic honeycomb cores and a photocatalytic honeycomb assembly housing. The one or more photocatalytic honeycomb cores are arranged in a honeycomb form. The photocatalytic honeycomb core is formed of three or more basic core units and a light guide member that is Y-shaped in an end view.
