Abstract: An event-triggered preassigned finite-time tracking control problem with active disturbance rejection is studied for a class of strict feedback nonlinear systems. An event-triggered preassigned performance finite time control strategy with ADRC is proposed on the basis of a backstepping method, an ADRC technique, a preassigned performance, and a finite time control method. A controller is also designed for this purpose. In the recursive design of each step, an extended state observer in ADRC is used to estimate the unknown items in the system. A tracking differentiator is utilized to estimate the derivative of the virtual control and avoid differential expansion. With the designed controller, the output of the system tracks the given reference signal with a presetting accuracy within a given settling time, and all the signals in the closed-loop system are bounded. Through the event trigger mechanism, continuously updating the control input is unnecessary. Thus, communication resources are saved. Simulation results also verify the validity and advantages of the proposed controller.