The utility model discloses an electric detonator piezoresistor detects frock, two mounting grooves of its insulator foot middle part design are installed the guide arm base respectively and are detected the base, detect the base upper surface and set up a plurality of semicircle cambered surfaces, two guide arms alternate in the guide arm base, and depression bar one end is fixed on the guide arm, and the other end is together fixed with the tucking, the nut is screwed in the guide arm top, and the tucking lower extreme hangs in the semicircle cambered surface top of detecting the base upper surface, set up reset spring and spring dog in the cavity of guide arm base, on test cable's positive pole was connected to and detects the base, the negative pole was connected to on the guide arm base. This frock not only possesses piezoresistor interelectrode voltage quality and detects the function, can also detect piezoresistor spare assembly fore -and -after insulating layer quality simultaneously, has reliably solved this type of electric detonator insulating layer and has damaged the potential safety hazard scheduling problem that the electric leakage brought.