Automobile trunk storage box

The utility model relates to an automobile trunk storage box, which comprises a pair of rectangular frames, pins, a seat cushion, a bag, a safety triangular warning board, hooks, a shoulder strap, assembling parts and an auxiliary bag, wherein the rectangular frames are formed by common metal pipes in a bending way and are intersected in an X shape; the pins are arranged at the intersected points of the rectangular frames and are used for jointing the rectangular frames; the seat cushion is installed at the upper jointed part of the rectangular frames; the bag is inserted into a foldable chair below the seat cushion, a storage space is formed in the bag and the front surface of the bag is provided with a zipper; the safety triangular warning board is arranged on the back surface of the foldable chair, the upper part of the safety triangular warning board is jointed with the interrupted part of the upper jointed part of the rectangular frames, and the lower part of the safety triangular warning board is jointe