The utility model relates to a fire gun sprays recoil strength detection device and detecting system, wherein, the fire gun sprays recoil strength detection device and includes chassis, bracket, fire extinguishing agent supply pipeline, fire gun and pressure sensor, the bracket slides and locates the chassis, the fire extinguishing agent supply with the pipeline connect in the fire gun, the fire extinguishing agent supply with the pipeline set firmly in the bracket, pressure sensor locates the chassis, under the anti - action of impulsive force of injection of fire gun, the bracket can bear the fire extinguishing agent supply with the pipeline with the fire gun is followed the chassis slides, the touching pressure sensor, pressure sensor is used for detecting the injection recoil strength of fire gun. The utility model discloses can accurately detect out the recoil strength of fire gun under different flows, different injection medium and the different spraying pressure condition reliably, provide the basis for the structural strength and the stability design of whole car, be favorable to the lightweight design of whole car and the matching of population parameter.