The invention relates to a long flame true fire generator. The long flame true fire generator comprises a Laval injection pipe, a fuel supply pipe, an atomization medium supply pipe and an igniter arranged on the Laval injection pipe, wherein the fuel supply pipe and the atomization medium supply pipe are connected with the Laval injection pipe. A main flame injection opening connected with the fuel supply pipe and used for injecting long-distance flames, expansion flame injection openings used for enlarging the flame sectional area and multiple atomization medium injection openings connected with the atomization medium supply pipe are arranged in the Laval injection pipe. The invention further relates to a true fire simulation device provided with the long flame true fire generator. The true fire simulation device further comprises a fuel supply system, an atomization medium supply system, a remote control ignition device and a remote control system for controlling the above systems and device to operate. According to the long flame true fire generator, the long-distance flames can be generated, meanwhile, the large flame sectional area is achieved, a good flame form can be formed, and the technological level of domestic fire drill devices is increased.