The invention provides a mortar levelling and paving device, and belongs to the technical field of building construction equipment. The mortar levelling and paving device comprises a rack, a scrapingmechanism and leveling mechanisms. The scraping mechanism comprises a scraping part and a tilt angle sensor, the tilt angle sensor is arranged on the scraping part, and is used for detecting the tiltcondition of the scraping part, the two ends of the scraping part are each provided with one leveling mechanism, each leveling mechanism is connected with the rack and the corresponding end of the scraping part to form a linkage structure, the leveling mechanisms are used for being in data connection with the tilt angle sensor, according to the tilt condition, detected by the tilt angle sensor, ofthe scraping part, the corresponding ends of the scraping part are driven to lift, the scraping part swings to the leveling state under the linkage effect of the leveling mechanisms, the scraping part and the rack, the scraping part can be automatically leveled to level and pave the mortar, work efficiency is high, after leveling, levelness is high, and the levelness yield of the large-area mortar ground can be well ensured.