The invention relates to a wet metallurgy technology of copper and cobalt resources, in particular to a complex high-silicon copper-cobalt alloy alkaline pretreatment-normal pressure acid leaching process. The technical conditions of the invention are that: the using amount of NaOH is 70 percent of the weight of a copper-cobalt alloy; the alkaline roasting temperature is 600 DEG C; the roasting time is 2 hours; the roasted residue is finely ground to 100 percent to 200 meshes, washed with water at the temperature of 90 DEG C and then fed for first-stage leaching; the first-stage leaching temperature is 90 DEG C; the using amount of sulfuric acid is 0.9 times the theoretical using amount for reaction of cobalt and iron in the alkaline pretreatment residue; the liquid-solid ratio ml/g is 15 to 1; the leaching time is 4 hours; the stirring rotation speed is 600r/min; air is continuously blown in during leaching; a three-stage reverse flow continuous leaching mode is used in the second stage; the second-stage leaching temperature is 90 DEG C; the liquid-solid ratio ml/g is 5 to 1; a leaching agent contains 24g/L of free copper ions; the initial concentration of the sulfuric acid is 137g/L; the leaching time of each stage is 3 hours; the stirring rotation speed is 600 r/min; the leaching ratios of cobalt and copper are up to above 99 percent.