The invention discloses a sand basin device for breeding a pet. A cavity is formed in a shell. A through groove is formed in the front side of the shell. A cat sand basin is arranged on the front sideof the shell. A sand unloading basin inclining towards the cat sand basin is arranged on the inner surface of the shell. A filtering mechanism capable of filtering and cleaning cat sand is arranged on the upper side of the sand unloading basin. A cleaning mechanism capable of cleaning the filtering mechanism after filtering is arranged on one side of the filtering mechanism. An isolating mechanism which can isolate the filtering mechanism from the sand unloading basin when the cleaning mechanism conducts cleaning is arranged on the filtering mechanism. A sealing mechanism which can seal the sand unloading basin and prevent the sand from being unloaded into the cat sand basin is arranged at the front end of the shell. A sand sending mechanism which can pour cat sand in the cat sand basin into the filtering mechanism is arranged between the shell and the cat sand basin. A hypochlorous acid spraying mechanism is arranged on the shell. The sand basin device is simple in structure and convenient to use.