The invention provides a self-decompression trailer for CNG emergency rescue field work construction, and relates to the long pipe trailer with a decompression slide. The trailer comprises a frame, a gas bottle set, a front bin safety device, an air inflation operation bin, a power take-off, an electric generator, an automotive chassis and a decompression pipe system. The frame is fixed to the automotive chassis. The gas bottle set, the front bin safety device and the air inflation operation bin are fixedly arranged in the frame. The front bin safety device and the air inflation operation bin are communicated with the front portion and the rear portion of the gas bottle set in a sealed mode. A decompression pipe, the power take-off and the electric generator are fixed into the frame below the inclined gas bottle set; the decompression pipe is communicated with the gas bottle set in the air inflation operation bin in a sealed mode. The self-decompression trailer integrates transport, decompression, conveying and application and can meet natural gas decompression and emergency conveying application without other external devices and power sources at any place.