Device capable of switching optical slits on line

The utility model relates to a device capable of switching optical slits on line, and aims to solve the technical problems that in the prior art, vacuum needs to be released and manual operation is needed for slit replacement, a large amount of time is needed for vacuum release and reacquisition, the efficiency of an optical experiment is greatly reduced, and the manual operation is not facilitated. According to the utility model, the optical slit of which the length is greater than twice of the single use length of the optical slit is arranged, the light transmission window corresponding to the single use length of the optical slit is arranged on the slit cover plate, and the optical slit is driven to move by the slit motor and the ball screw, so that the single use optical slit at the light transmission window can be switched on line; the longer the total length of the optical slit is, the more the switchable times of the device capable of switching the optical slit on line is; and vacuum release and re-acq