The invention provides a rotor engine internal ignition device. The device comprises a rotor engine rotor, a cylinder body and an end cover, the rotor engine rotor is installed in the cylinder body, the end cover is fixed to the end face of the cylinder body, an internal sparking plug is installed in the rotor engine rotor, and the internal sparking plug is communicated with an electrifying device. The electrifying device comprises a first conductive device and a second conductive device, the second conductive device is installed on the surface of the end cover, the first conductive device isinstalled on the end face of the rotor engine rotor, the first and second conductive devices contact to be communicated by the rotation of the rotor engine rotor, the second conductive device is connected with a power supply which is used for allowing the internal sparking plug to operate, the first conductive device is communicated with the internal sparking plug and used for allowing the internal sparking plug to ignite a combustion chamber. According to the device, the purpose of the internal ignition of the rotor engine is achieved through the controlling of the rotor and the contacting piece of a cylinder wall, the defect of incomplete combustion of the rotor engine is overcome, and the performance of the rotor engine is effectively improved.