The invention discloses a projectile shock wave width-based shot indicating system, which relates to a projectile shock wave width-based shock wave shot indicating system. The system is mainly used for realizing an accurate shot indicating function during ball firing of ultrasonic projectiles of muskets, machine guns, sniper rifles, vertical sight line guns and the like. The system consists of a signal acquisition unit, a display terminal and a target surface, wherein the signal acquisition unit consists of a shock wave sensor array and a micro processing plate; the shock wave transducer array consists of a shock wave sensor Q1, a shock wave sensor Q2, a shock wave sensor Q3, a shock wave sensor Q4 and a shock wave sensor Q5 which are distributed in a non-collinear way; the shock wave sensor array is positioned at the bottom of a target plane; the signal output end of the shock wave sensor array is connected with the input end of the micro processing plate; the micro processing plate comprises an amplifying circuit, a comparison circuit, a pulse signal width measuring circuit and a DSP (Digital Signal Processing) circuit; and the display terminal is a computer in which a display program is installed.