Flat plate transportation semitrailer with protective structure

The utility model discloses a flat plate transport semitrailer with a protective structure, which comprises a frame, a protective cabinet, an adjusting rod and a connecting plate, a hydraulic pump is fixedly arranged in a storage cavity A, a pressure adjusting meter and an electromagnetic valve which are matched with each other are respectively and fixedly arranged on the hydraulic pump, and a water adding chamber is arranged at the top of the interior of a mounting chamber A; a lower supporting plate is fixedly installed at the bottom of the other side of the protection cabinet through a connecting plate, an upper supporting plate is rotatably installed on the lower supporting plate through a rotating ball, a limiting adjusting rod is fixedly installed on the upper supporting plate, and a spray head connecting piece is fixedly placed in the limiting adjusting rod; a high-pressure spray head is fixedly installed on one side of the spray head connecting piece through a threaded connecting end, and a sealing ri