The invention discloses a portable tunnel fire-fighting equipment based on municipal water supply. The structure includes a spray gun head, an extension pipe, a water flow valve, a water supply pipe, a winding reel, a rotating shaft, and a fixing frame. The end of the spray gun head is flange-connected to the extension pipe. , the end of the extension pipe is connected to the flange of the water supply pipe, the water supply pipe is nested and connected to the surface of the reel, the center of the reel is movably matched with the rotating shaft, the center of the rotating shaft is nested and connected to the water supply pipe, and the end of the water supply pipe is nested with the water flow valve connection, the gap between the water flow valve and the spray gun head is matched, and the fixed frame is nested and matched with the top of the water supply pipe. The spray gun head includes a flow chamber, a water outlet, a diffuser, and a pipe sleeve. When the runner rotates, it presses its swing page into the card slot so that the rope slider covers the cavity of the blocking block, blocks it in a disguised form, increases the water flow pressure in the overflow cavity, and effectively solves the problem that the distance is too long In the case of insufficient pressure, pressurize in a disguised form to ensure that the water flow pressure is sufficient.