Abstract: A foldable box structure comprises two main bodies and at least four actuation bodies. Each of the main bodies has a first lateral and a second lateral. Each of the actuation bodies has a first pivotal edge and a second pivotal edge. The first pivotal edges of the actuation bodies are pivotally coupled to the first laterals and second laterals of the main bodies to form rotation axes. The actuation bodies, which are coupled to the main bodies and at the same side of the main body, are pivotally coupled to each other in the second pivotal edges to form other rotation axes. The actuation bodies are pivotally rotated with respect to the rotation axes and stacked between the main bodies to have a close state. The actuation bodies are pivotally rotated with respect to the rotation axes to expand together with the main bodies and have an open state.