The utility model provides a non-contact type displacement measuring system. The system includes an image sensor, a semiconductor laser, an optical lens group, a digital arithmetic unit, a control chip and a power supply; the semiconductor laser is used as a light source, and laser is irradiated on the surface of a measured object; the optical lens group focuses laser beams reflected by the surface of the measured object on an image sensor to form a frame image, the digital arithmetic unit performs operation on the frame image through a correlation matching algorithm to obtain movement information of the measured object in a sampling period and outputting the movement information to the control chip, and the actual displacement of the measured object can be obtained after the control chip performs processing and operation on the movement information. The non-contact type displacement measuring system has the characteristics of non-contact, accuracy, simpleness, good stability, and no need for addition of a compensating circuit, and thus has broad application space.