Water treatment device of aquariums

The utility model discloses a water treatment device of an aquarium, and solves the problems of short using period of filter material, easy blockage, long connecting pipe and large power consumption. The water treatment device arranged at one end of the aquarium and integrated to a whole with the aquarium mainly consists of a physical interception and biodegradation reactor, a biochemical treatment reactor, an activated carbon adsorption reactor, and a sedimentation tank which are arranged from bottom to top; the physical interception and biodegradation reactor contains a biochemical ball which can move in a suspending manner therein; the biochemical treatment reactor contains a ceramic ring which provides a multiplying place for nitrifying bacteria; the activated carbon adsorption reactor mainly contains activated carbon which removes pollutants, and decolorizes and filters and purifies liquid; the three reactors are arranged in a glass box and isolated by three glass separators which are provided with holes, and are convenient to detach and clean and convenient for filter material changing; a row of mud holes is respectively arranged below the physical interception and biodegradation reactor and the sedimentation tank; the lower part of the physical interception and biodegradation reactor is connected with an inlet pipe of a submersible pump in the aquarium; and a flow baffle is mounted in a position in the sedimentation tank and close to the three reactors.