The invention discloses a solar 
photocatalytic degradation device, belongs to the technical field of 
sewage treatment and particularly relates to a device which solves the problems that a 
sewage treatment device is high in 
energy consumption, high in price and prone to secondary 
pollution by using a modified photocatalyst responsive to 
ultraviolet visible light and taking 
sunlight as a 
light source to drive reactions to degrade pollutants. The device mainly comprises reaction tanks, hollow pipes, air ejecting pipes, an 
air pump, a transparent stair-shaped 
photocatalytic reaction chute, circular arc baffles, a water conveying 
pipe, a water pump, a water collecting 
pool and a 
solar cell panel. The reaction tanks are used for providing sites for homogenizing and 
processing sewage, the hollow pipes are used for carrying 
ultraviolet visible light modulator tubes, the air ejecting pipes and the 
air pump are used for aerating the reaction tanks, the transparent stair-shaped 
photocatalytic reaction chute is used for providing a 
photocatalytic degradation site, the circular arc baffles are used for homogenizing and slowing down a sewage solution, the water conveying 
pipe and the water pump are used for conveying the sewage in the water collecting 
pool into the reaction tanks, the water collecting 
pool is used for collecting degraded sewage, and the 
solar cell panel is used for storing 
electric energy. The 
sunlight is mainly used, and the device has the advantages of being clean, efficient, free of secondary 
pollution, controllable in reaction 
atmosphere, high in 
light source utilization rate and the like.