Abstract: A launching device of a roller coaster, which includes a connecting member. The connecting member is provided with an assembly groove, and two sidewalls of the assembly groove are each provided with a fixing plate. The fixing plate is provided with a magnetic plate assembly. A bottom of the connecting member is connected to a pushing plate. The launching device is arranged on a frame of the roller coaster. A connection concave portion is provided at a location where the pushing plate and the connecting member are connected. A side of the connecting member located at a lower part of the assembly groove is provided with a first mounting corner fitting the connection concave portion.