A triaxial helicopter includes a fuselage and an airframe, and three rotor modules and a driving source are installed to the airframe, and two turbofans are mounted at the tail of the airframe, and the horizontal elevator is installed between the two turbofans and coupled to the driving source through a link rod module, so that when the triaxial helicopter is operated, the two turbofans are operated to produce a backward airflow to assist propelling the triaxial helicopter to move forward, so as to improve the flying speed of the triaxial helicopter. When it is necessary to ascend or descend the triaxial helicopter, the driving source controls the link rod module to adjust the yaw direction of the horizontal elevator according to an ascending or descending requirement, and the airflow produced by the turbofans blows in a direction with the horizontal elevator to increase the lifting force of the triaxial helicopter.