Scraper for building

The utility model discloses a building scraper which comprises a handle and a scraper holder fixedly connected with the handle, a blade extending opening is formed in the bottom of the scraper holder, a sliding way is arranged in the scraper holder, a blade stacking cavity matched with a blade in width is formed in one side of the sliding way, a sliding block is arranged in the sliding way, and a movable block is arranged on the side, close to the blade stacking cavity, of the sliding block. A first elastic piece is arranged between the movable block and the sliding way, a blade groove matched with the single blade in thickness and width is formed in the movable block, the blade stretching-out opening is communicated with a blade positioning groove in the tool apron, the blade positioning groove is matched with the movable block in size, a pressing through hole is formed in the side, away from the sliding block, of the blade positioning groove, and bevel edges are arranged on the two sides of the cutting edge