Normal-stressed Electromagnetic Linear Actuator (NELA) is a new type of actuator that utilizes magnetic resistance to achieve microdisplacement motion with high reliability, high efficiency, and high response speed. In this paper, we propose to use NELA for aircraft brake actuation and study its high force density design method for the performance requirements of the onboard actuator. Firstly, an aircraft electric brake structure integrating NELA is proposed, and a linear brake is utilized to realize the parallel drive of NELA and the electromechanical actuator; secondly, a mathematical model of axial electromagnetic force of NELA is established by using the Maxwell's stress tensor TZ integrating around the surface S of the armature, and the axial electromagnetic force of the actuator is used as the objective function, and the actuator's structural and electromagnetic parameters are used as the design variables, so as the dimensions of the actuator winding window and the saturation magnetization of the stator cross-section are used as the design variables. The size of the actuator winding window and the saturation flux limit of the stator cross-section are taken as the constraints to establish an optimization design model, and the configuration design of the actuator to achieve the maximum axial electromagnetism under a specific size is obtained by solving the optimization model. Then, the electromagnetic finite element simulation analysis of the actuator is carried out to obtain the flux distribution inside the actuator and the linear relationship between the axial load carrying capacity of the actuator and the current and axial displacement, and the simulation results show that: the axial electromagnetic force of the actuator and the axial position of its actuator are approximately in linear relationship within the travel of ± 1 mm, and the maximum force density of the actuator reaches 500 N/kg.