Abstract: An optical unlocking device for identifying user operation through optical projection and acquisition so as to unlock a device or a program, and the unlocking device specifically includes a software algorithm module, a hardware module and a valid operation area. The hardware module includes an optical emission module, an image acquiring module and a processor. Unlocking method includes the following steps: firstly, acquiring and analyzing user operation data; secondly, extracting the characteristic data information about the area of interest; and making a judgment on unlocking or status switchover by comparing the characteristic data.