Hydraulic cylinder stroke measuring device and measuring method

The invention discloses a hydraulic cylinder stroke measuring device and method, and belongs to the technical field of hydraulic cylinder measuring equipment.The hydraulic cylinder stroke measuring device comprises a linear guide rail, a moving trolley, a driving motor, a supporting component, a position scale, a position information marking component and a supporting seat; the moving trolley is assembled on the linear guide rail; the driving motor is mounted on the moving trolley and drives the moving trolley; the supporting component is installed on the moving trolley and provided with a supporting plane. The position scale is provided with scale marks arranged in the extending direction of the linear guide rail. The position information marking part is mounted on the moving trolley; the supporting base is arranged on one end side of the linear guide rail and provided with a supporting part which applies pressure perpendicularly pointing to the supporting plane to the hydraulic cylinder. According to the te