The invention discloses a method for testing braking force of a
muzzle brake. The method is characterized in that four measuring points on the outer surface of a
barrel close to the
muzzle brake are symmetrically selected, a unidirectional
strain gauge is adhered on each measuring point, and directions of sensitive grids are coincided with the axial direction of the
barrel; the strain gauges of the measuring points on upper and lower surfaces of the
barrel form a bridge
system, the strain gauges of the measuring points on left and right surfaces of the barrel form another bridge
system, and an average value is solved via strain on the two bridge systems; a gun shoots, the
muzzle brake is impacted by a gas flow of the gun in an aftereffect period, tensile force is applied to the barrel by the muzzle brake, and accordingly the barrel stretches and deforms; and the strain gauges sense that the barrel stretches and deforms, electric signals are generated and are transmitted to a
data acquisition unit by a dynamic strain indicator, the
axial strain of the barrel caused by the muzzle brake is acquired via
data processing, and the braking force is acquired by the aid of the Hooke's law. The method has an epoch-making significance in studying a law of
recoil resistance of guns, reducing shooting exciting force and vibration of muzzles and improving shooting dispersion of the guns.