The device is designed based on the Gonow 2.8TC electronically-controlled high-pressure common rail diesel engine (BOSCH common rail system) to simulate engine startup, speedup, slowdown and other actions, so as to illustrate the structure and working principle of electronically-controlled diesel engines. The device applies to electronically-controlled high-pressure common rail diesel engine and maintenance training courses of secondary and senior vocational schools, ordinary education and training institutions.