The invention relates to a warehouse system based on an AGV delivering and loading small handcart and a warehousing and warehouse-out method. The loading small handcart is a tool outside a warehouse and for delivering goods and a carrier inside the warehouse and for loading the goods, and the goods can be scanned on the loading small handcart and do not need to be scanned gradually by manual work; and when the goods are out of the warehouse, the loading small handcart is directly delivered to an entrance of the warehouse through an AGV trolley to be wholly scanned, when the goods of the loading small handcart are completely unloaded, the loading small handcart is placed at a gate of the warehouse so as to be used when the goods are stored, and thus a good in-out warehouse cycle is formed. Compared with tradition manual goods storing and taking or other warehousing systems or methods in the prior art, the storing steps can be reduced, and the automated degree is high, so that the whole logistical warehousing process is neat, efficient and convenient; when goods allocation of the warehouse is changed, only a navigation magnetic stripe and a RFID positioning piece need to be planned and arranged again, and due to the fact that the navigation magnetic stripe and the RFID positioning piece are adhered to the ground, no damage is caused to the ground; and the warehouse is very convenient to use for other purposes.