NOVELTY - A floating photobiofiller for processing sewage comprises an internal filter loading shell and an external loading layer. The internal filter loading shell is a hollow ball body made of polyethylene or polyurethane and has diameter of 3-5 cm. The external loading layer is composed of biological bacteria sludge embedded in sol mixed with titanium dioxide, where ratio of sol at 30 degrees C and biological bacteria sludge is 1:1. The biological bacteria sludge is the flocculate formed by bacterium, fungus, protozoon, histozoa and metal hydroxide.    USE - A floating photobiofiller for sewage treatment, particularly printing and dyeing sewage treatment (claimed).    ADVANTAGE - As the internal filler loading shell is of a hollow structure, the filler is floated in the water and irradiated by sun to photochemically catalyze and degrade the sewage. As the microorganism is embedded in the external loading layer, the biological treatment and the light degradation are tightly coupled and cooperated to improve the treatment effect of sewage and improve the treatment efficiency. The photobiofiller is fluidized in water and has good mass transfer performance without fixed truss, low cost, long service life and convenient exchanging property. Problems of corroding the fixed truss by the wastewater in the filler so that the service life of the filler is short and the treatment effect is poor can be solved.    DETAILED DESCRIPTION - A floating photobiofiller for processing sewage comprises an internal filter loading shell and an external loading layer. The internal filter loading shell is a hollow ball body made of polyethylene or polyurethane and has diameter of 3-5 cm. The external loading layer is composed of biological bacteria sludge embedded in sol mixed with titanium dioxide, where ratio of sol at 30 degrees C and biological bacteria sludge is 1:1. The biological bacteria sludge is the flocculate formed by bacterium, fungus, protozoon, histozoa and metal hydroxide. The sol mixed with titanium dioxide is prepared by uniformly mixing polyvinyl alcohol, sodium alginate, polyacrylamide, crosslinking N,N'- methylenebisacrylamide and water, where ratio of water, polyvinyl alcohol, crosslinking N,N'- methylenebisacrylamide, polyacrylamide and sodium alginate is 1200-1700:210-270:90-150:100-130:1; heating in water bath to 90-98 degrees C, and adding 10-20% titanium dioxide. INDEPENDENT CLAIMS are included for:    (1) preparation of the floating photobiofiller comprising after uniformly mixing, heating polyvinyl alcohol, sodium alginate, polyacrylamide, crosslinking N,N'-methylenebisacrylamide and water in water bath to 90-98 degrees C, dissolving, and adding 10-20% titanium dioxide, completely stirring and mixing to obtain sol mixed with titanium dioxide; cooling the sol mixed with titanium dioxide to below 30 degrees C, mixing with biological bacteria sludge at a ratio of 1:1 to form external loading layer; uniformly coating the external loading layer on the internal filler shell, where the coating thickness is 0.5-1 cm; after coating, putting in saturated boric acid solution and crosslinking; after crosslinking at 30 hours, taking out, washing in water to obtain the floating photobiofiller;    (2) application of the floating photobiofiller on aspect of sewage treatment; and    (3) application method of the floating photobiofiller on aspect of printing and dyeing sewage treatment comprising putting the photobiofiller in a rounded reactor; after mixing the printed sewage and the photobiofiller at a ratio of 100-200:1, aerating at the bottom of the reactor; controlling the dissolved oxygen to be 3-5 mg/L; after 12 hours, finishing the printed sewage treatment.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating the floating photobiofiller for processing sewage.