Protective device for carriage and transportation device

The utility model relates to a protection device for a carriage and a transportation device. The protection device comprises a compartment, a first protection assembly, a second protection assembly and a locking mechanism. Wherein the first protection assemblies are rotatably arranged on the two sides of the carriage in the first direction of the carriage; the second protection assemblies are slidably arranged on the two sides of the carriage in the second direction of the carriage. The locking mechanism is used for locking the first protection assembly and the second protection assembly in an unlocking mode. The two first protection assemblies can be spliced at an opening in the upper portion of the compartment when rotating to a set position in the direction close to each other, and the two second protection assemblies can be jointly spliced with the spliced first protection assemblies and the compartment to form a containing cavity when sliding to the set position in the direction away from the bottom of t