Device for improving flatness of large-area floor

The utility model provides a device for improving the flatness of a large-area floor, the device comprises a guide rail, elevation controllers and an alignment rope, the top of the guide rail is provided with a sliding chute, the elevation controllers are arranged in the sliding chute in a sliding manner, the sliding directions of the elevation controllers are parallel to each other, the alignment rope is arranged at the top of the elevation controllers, and the guide rail is arranged on the guide rail. And the connecting piece is used for connecting the two adjacent elevation controllers. The prefabricated guide rails uniform in size and shape are beneficial to simplifying construction procedures, and in the large-area floor construction process, compared with a traditional method of paying off, mortar cake manufacturing and screeding, the construction efficiency is greatly improved; the elevation controller and the alignment rope can move in the sliding groove in the guide rail and move to the point positio