Child mother vehicle is an efficient three-dimensional storage and handling equipment that achieves intelligent transportation of goods through the collaborative operation of "mother vehicle+child vehicle". Its core features are as follows: Efficient division of labor and collaboration: The mother vehicle is responsible for moving between the main aisle of the shelf, while the child vehicle carries goods and shuttles between the mother vehicle and the shelf aisle, without the need for forklifts to enter dense storage areas, greatly improving storage and retrieval efficiency. Maximizing space utilization: Suitable for high-density shelf layout, reducing channel occupation, and increasing storage density by 20% -40% compared to traditional forklift operations, especially suitable for centralized storage of bulk goods. Flexible adaptation scenarios: Supports first in first out (FIFO) or first in last out (LIFO) modes, which can be flexibly switched according to the characteristics of the goods (such as shelf life, turnover rate), adapting to multiple industries such as e-commerce, cold chain, and food. Reduce labor costs: Reduce the operating intensity of forklift drivers, lower the frequency of manual intervention, and lower the risk of cargo loss caused by manual operation errors. Strong scalability: System expansion can be achieved by increasing the number of shuttle cars or expanding shelf units to meet business growth needs, with lower maintenance costs in the later stage.