Device for measuring parallelism of side working surface of elevator guide rail

The invention discloses a device for measuring parallelism of a side working surface of an elevator guide rail, which belongs to the technical field of elevator guide rail measurement, comprises a measuring plate, and is characterized in that a storage battery is embedded in the upper part of the inner side of the measuring plate; a regulation and control switch is mounted on the front side of the storage battery; a positioning mounting frame structure is mounted on the right lower side of the measuring plate; the left side and the front and rear sides of the middle of the measuring plate are respectively provided with a laser positioning frame structure. During continuous measurement, the U-shaped positioning frame can be sleeved on the outer side of the guide rail, and then the positioning wheel moves on the outer side of the guide rail, so that the function that the measuring device stably moves on the guide rail for detection is realized; the protective plug is inserted into the inner side of the mounting