The invention discloses a device for automatically loading and unloading goods for a container. The device is characterized by comprising a transport trolley and a stacking mechanism, wherein a plurality of magnetic nails are laid on the bottom surface in the container according to a grid shape to form a motion track of the transport trolley; and the transport trolleys are arranged at the bottom in the container according to a square-shaped track and circularly move along the square-shaped track. Compared with the prior art, the device has the advantages of being simple in structure and high in applicability, improving the automation level of automatic loading and unloading of the container and goods stacking, reducing transportation and labor cost to a certain extent, and improving loading and unloading efficiency.