Aiming at the equipment development trend of long-range rocket, the design of ignition device for long-range rocket engine was improved. The structural design, numerical calculation, technical links and functional verification to meet the functional requirements were studied. The design and test of the ignition device of certain type improved long-range rocket solid rocket motor were introduced. The results show that the related improvement and test can provide a reference for the design of the ignition device of the following series of rocket motors.