Servo actuator stroke detecting device

The invention relates to a stroke detecting device, in particular to a servo actuator stroke detecting device. The device is composed of a base, a servo actuator fixed end device, a servo actuator moving end device, a precise worktable, a high-precision grating ruler and a display device. The servo actuator fixed end device is fixed to the base, the servo actuator moving end device is fixed to theprecise worktable, and is connected with an actuator piston rod, a ruler body part of the grating ruler is mounted on the side face of the worktable, a reading head is connected with the servo actuator moving end device through a connecting plate, and a grating ruler data display instrument is mounted on the base and is connected with the reading head through a cable. The control precision of a servo actuator can be judged, test data accuracy and precision are ensured, a reliable basis is provided, servo actuator stroke measuring precision is improved, and work efficiency is improved. 本发明涉及一种行程检测的装置，尤其涉及一种伺服作动器行程检测装置