The invention belongs to the field of the metallurgical technology and particularly relates to a method for improving the surface quality of a hot-rolling high-strength medium plate. According to the method, the percentage composition of chemical constituent Si in the hot-rolling high-strength medium plate is controlled to be 0.1wt.%; finish rolling is directly conducted without holding delay after rough rolling; before finish rolling is conducted for the first time, high pressure water descaling is conducted, and then rolling is conducted for the second time; when a plate blank restores to the space between a rough rolling rack and a finish rolling rack, holding delay is conducted, and the temperature of the plate blank is made to reach the temperature of the final rolling of the finish rolling; rolling is conducted continuously; descaling is conducted again at final rolling time. Consequently, the hot-rolling high-strength medium plate which is improved in surface quality and free of pocking marks and piebaldness is obtained. According to the technical scheme of the method, generation of the defect of pocking marks on the surface after shot blasting of products is effectively controlled, and the foaming phenomenon of oxide iron sheets before finish rolling is started is obviously restricted, so that the purpose of enabling the oxide iron sheets to be thinned and be even in thickness is achieved, occurrence of piebaldness defects on the product surface is effectively restricted, and the surface quality of products is improved.