The invention discloses a three-side adjustable scraper of a squeezer, which comprises a scraper body arranged in a squeezer body; one side of the scraper body is a scraper opening; the scraper opening is fit with the wheel surface of a squeezing wheel of the squeezer; a left side scraper holder and a right side scraper holder are arranged on the scraper body; the left side scraper holder and the right side scraper holder are respectively arranged with the scraper body in an adjustable way; a left side scraper and a right side scraper are respectively arranged on the left side scraper holder and the right side scraper holder; and the openings of the left side scraper and the right side scraper are respectively fit at the two sides of the squeezing wheel of the squeezer. As the left side scraper and the right side scraper are additionally arranged on the foundation of the scraper, materials adhered on the two sides of the squeezing wheel can be scraped by the three-side adjustable scraper of the squeezer; therefore, the adhered materials are scraped in an alldirectional way and split materials are sufficiently scraped.