The invention discloses a servo system for a retractable tray switching mechanism. The servo system includes a main drive motor for driving a tray support to move on a main rack; a main drive controller for controlling the motion of the main drive motor; an auxiliary drive motor for driving a positioning support to move on an auxiliary rack which is mounted on the tray support; and an auxiliary drive controller for controlling the motion of the auxiliary drive motor. The invention further provides a control method of the servo system for the retractable tray switching mechanism. The invention can overcome the deficiencies of the prior art, conducts corresponding optimization for motion characteristics of the retractable tray switching mechanism, improves the positioning speed of the servo system and simplifies the structure of the servo system.