Multifunctional extension frame for rear bucket of pickup truck

The utility model relates to a multifunctional expansion frame for a pickup truck rear bucket, which belongs to the technical field of space expansion of pickup truck rear buckets and comprises an overturning seat, a rotating structural member and a ladder, the overturning seat is connected with a side plate at the tail of a carriage of a pickup truck, the rotating structural member is mounted on the overturning seat, and one end, connected with the ladder, of the rotating structural member is arc-shaped. Arc-shaped sliding rods are arranged in the arc-shaped ends in the rotating structural parts, extending sliding rods are arranged at the two ends of the ladder, and the ladder is connected with the arc-shaped sliding rods of the rotating structural parts through the extending sliding rods at the two ends. The rear door of the pickup truck can be put down to form a bearing platform, then the expansion frame is turned over and put down to be located on the rear door, at the moment, the carriage loading space o