Gravel crushing, shaping and grading system

The invention discloses a gravel crushing, shaping and grading system which comprises a crusher for crushing stones, and crushed gravels are discharged from a discharge port in the bottom of the crusher; the device further comprises a screening machine capable of scraping off attached fine sand in a self-adaptive mode, the screening machine is installed below a discharging port of the crusher, and the screening machine screens out gravel with different grades of particle sizes from the crushed gravel. The conveying belt machines are installed at discharging ports of the screening machine, the number of the conveying belt machines corresponds to the number of the discharging ports of the screening machine, and the conveying belt machines convey gravels with different particle sizes screened by the screening machine to the corresponding stock bins for grading. The scraper is in contact with the bottom surface of the conveying belt to scrape off the attached fine sand, and after the conveying belt which runs for