The invention discloses a mining method for an inclined medium-thick metal ore body. The mining method comprises the steps of mining field division, pulse outer lane construction, ore-drawing and rock-drilling cross level construction, cutting groove construction, pre-control roof support, rock drilling and ore break down, ventilation, ore removal and gob area filling. According to the mining method for the inclined medium-thick metal ore body, each of mining fields is divided into an upper triangular ore body and a lower triangular ore body along the central position of the ore body trend forstoping, and the mining fields adopt a form of one-mining and one-pass and filling in time, so that the range of an empty field is effectively reduced in the stoping process, anchor rods are used forpre-controlling roofs of the mining fields to strengthen the support strength and reduce the collapse of the roof ore body, and the safety of job execution is fully ensured; and at the same time, rock drilling chambers are formed to transform drilling rock from fan-shaped middle-length holes in rock drilling roadways into vertical middle-length holes in the rock drilling chambers, rock drilling is facilitated and rock drilling efficiency is improved, parameters of the blast hole network are evenly arranged, the blasting effect is improved, and technical and economic indicators and the ventilation effect of the mining fields are greatly improved.