The electric trolley can drive automatically, has a strong climbing ability, and can also be operated on uneven roads. It has the advantages of small size, simple and flexible operation, 360-degree rotation, and can enter various narrow spaces such as floors, corridors, elevators, hanging baskets, etc., so it is suitable for construction sites, interior decoration, farms, factories and other places to transport sand, cement, earthwork, concrete, construction waste, domestic waste, animal manure, feed, etc.