The utility model discloses a multifunctional frequency doubling particle accelerator to overcome the defects in temporary accelerator that the energy is single, and that the current control power and the working frequency are constrained by the single power source. The accelerator consists of N impulse power sources that can generate multiple power, N of which is more than 2; N magnetic controlling tubes that connect to the impulse power source and generate N microwaves the has different power; a power mixing ring that has N import that connect to N magnetic controlling tubes and one output; the electronic gun that generates simultaneously whit generated N partial beams and accelerate pipes that connects the electronic gun and the power mixing ring. By utilizing the utility model of multifunctional frequency doubling particle accelerator, since the particle beam of multiple energy can be outputted alternatively with high working frequency and doubtable frequency, the utility model has profound application prospective in fields of radiation imaging, radioactive medicine, and radioactive processing.