In order to solve the inaccuracy, low efficiency and hidden safety problems existing in manual off-line detection in the mass production of pyrotechnics in China, an on-line detection technology is proposed. The test datum was designed in the mouth of the product, the floating structure of the datum was adopted, the basic principle of the test method was expounded, the working process was given, and the test, data analysis and other means were used for verification. The results show that under the premise of satisfying the on-line detection of initiating explosive devices group moulds, this technology can realize the man-machine isolation automation production in high-risk workstations, greatly improve the detection accuracy and improve the production status of the industry, which has reference and promotion significance.