The present invention relates to a device for pet excrement. The device senses a presence of a pet, determines whether a rotary unit is operating in response to the sensing of the presence of the pet, determines whether a weight equal to or greater than a first set value is applied to a load cell when the rotary unit is not operating, determines whether a weight equal to or less than the first set value is applied to the load cell when a weight equal to or greater than the first set value is applied to the load cell, and operates the rotary unit when a weight equal to or less than the first set value is applied to the load cell. According to the present invention, excrement removal, solid material supply, and excrement accommodation can be automatically performed by simply rotating a rotary unit.
