The invention relates to wear-resistant and corrosion-resistant gradient coatings of a middle trough of a scraper conveyor. The wear-resistant and corrosion-resistant gradient coatings can effectivelysolve the problems of uneven wear, serious corrosion and easy falling of coatings of an existing middle plate to a certain extent. According to the technical solution, the components of the coatingsare in gradient change, three parts are involved in total, the gradient coatings comprise the following components of, in percentage by weight, 43%-48% of Ni50, 47%-52% of Ni60, 1%-3% of TiC and 2%-4%of WC of a gradient coating-1, 38%-43% of Ni50, 42%-47% of Ni60, 6%-8% of TiC and 7%-9% of WC of a gradient coating-2, and 33%-38% of Ni50, 37%-42% of Ni60, 11%-13% of TiC and 12%-14% of WC of a gradient coating-3. According to the wear-resistant and corrosion-resistant gradient coatings of the middle trough of the scraper conveyor, the wear-resistant and corrosion-resistant gradient coatings have the characteristics of low water absorption rate, good toughness, light weight and the like, and have the main characteristics of wear resistance and corrosion resistance, meanwhile, by controllinggradient change of the components of the coatings, sudden change of structures and the performances among a base body and the coatings is avoided, the bonding condition among interfaces of the coatings are improved, the bearing capacity and the abrasion resistance of the coatings can be further improved, the overall service life of the middle trough can be effectively prolonged, and safe and efficient operation of the scraper conveyor is guaranteed.