Abstract: The present invention discloses an automatic storage box comprising a bottom case, a receptacle set, a receptacle, a top cover, and a rotary cover set. The inner surface of the bottom case is concaved to form an accommodation basin. A battery bay and a proximity sensor set are respectively arranged at two sides of the accommodation basin, and a dynamic device is arranged therebetween. The receptacle set and the receptacle are respectively detachably installed to the base case. The inner portion of the top cover is concaved downward to form a recess, and the lower rim of the top cover has a positioning element used to engage with the receptacle set. The rotary cover set is arranged above the top cover and pivotally coupled to the receptacle set. When the proximity sensor set detects the approach of a human body, the dynamic device instantly drives the movable cover to rotate to open.