Device for changing route range of micro-positioning stage

The utility model discloses a device for changing a route range of a micro-positioning stage. The device is composed of a base, a variable magnification time lever, a composite parallel four-rod guiding mechanism and a movable platform. Two parallel grooves are arranged below the base and two piezoelectric ceramic drivers are respectively placed in the respective grooves. The variable magnification time lever is downwards arranged in the middle of the base. Output hinges arranged in the upper part of the variable magnification time lever are hinged with the middle parts of two parallel flexible hinge parts and respectively enable two input hinges in the lower part of the variable magnification time lever to be contacted with the two piezoelectric ceramic drivers through pre-fastening screws. The variable magnification time lever is provided with a fixed hinge to be connected with the base. The two input hinges can independently receive input displacements of the piezoelectric ceramic drivers to transmit the amplified displacements to the movable platform so as to make an output displacement of the platform have two route ranges, thereby realizing a composite route range function for small routes and high precision or for slightly low precision requirements but relatively large route requirements.