During the test of the engine-retained release rocket sled, it is necessary to simultaneously verify 2 working states of the tested engine statically and dynamically. Focusing on how to accurately control the engine and other initiating devices to operate in order according to the pre-set time, this paper designs a ground multichannel timing ignition control system. The hardware design is introduced in detail. Based on this, the internal work flow and design method of the main control chip are given, and the test is verified. The results show that the system breaks through the key technologies of high precision timing control, multi-channel large current drive output, multi-channel output signal crosstalk, and environmental adaptability, etc. This design can achieve ignition control of multiple commands and multi-stage pyrotechnics on the missile.