The servo electric cylinder integrates the built-in brushless servo motor with the roller lead screw transmission structure. The rotational motion of the servo motor rotor is directly distributed around the main lead screw through the roller planet, converting the motor's rotational motion into the linear motion of the main shaft or nut. These structures endow the motor with the advantages of small size, low inertia, high rigidity, low noise, low temperature rise, fast response, smooth operation, precise control, strong overload capacity and long service life. This product can replace hydraulic and pneumatic applications and is an upgraded version of hydraulic and pneumatic equipment. It is a fully electric multi-degree-of-freedom platform and can also provide personalized customization services based on customer needs.