The invention relates to the technical field of fire fighting equipment, in particular to a skid-mounted fire fighting device and a
water supply fire extinguishing method.Hydraulic pumping equipment is arranged on a transfer skid and comprises a water inlet pipeline, a water outlet pipeline and a plurality of
plunger pumps, the
plunger pumps are arranged in parallel to form an execution pump set unit, and the execution pump set unit is connected with a hydraulic power mechanism; the hydraulic power mechanism is suitable for being connected with a hydraulic power source of a fire-fighting site. One end of the water inlet pipeline is connected with a
water source, and the other end of the water inlet pipeline is connected with the execution pump set unit. The transfer pry is adopted as a bracket, transfer or carrying of mobile equipment can be facilitated, a hydraulic power source of a fire-fighting site is adopted as a driving source, a high-power power source or a
diesel engine does not need to be arranged, and all
plunger pumps of the execution pump set unit are independently controlled, so that the flow and pressure of the fire-fighting device are adjusted according to actual scene requirements; and accurate control of fire extinguishing is realized.