The utility model discloses a digital detection device pulls trigger, including PCB circuit board [ 1 ], double - circuit button [ 4 ], voltage current detection module [ 5 ], battery [ 9 ], detect resistance [ 10 ] and test point [ 12 ], put into the breech breechblock with detection device, salvo percussion operation back, the test point with hit the needle contact, protection lid and breechblock ground connection form a return circuit, can directly record percussion voltage, press the double - circuit button after, can measure actual percussion current value. The utility model discloses can the high accuracy, harmless, automatic and intelligent percussion voltage or the electric current that hits the needle that detect, the precision is high, with low costs, test method reliable and simple.