The invention provides a method to extract the NiCo from a hartmanite by a hydrochloric acid method, which is characterized in that the hartmanite is acted as a raw material, a semi-finished product of NiCo is extracted, the hydrochloric acid is regenerated and recycled, and simultaneously the washing water is recovered and recycled without emitting any waste and polluting the environment after the processes of mining, ore preparing, ore leaching, separating, leached residue recovering, leaching mother solution, Co precipitating, roasting, regenerating hydrochloric acid, and utilizing. The method to extract the NiCo from a hartmanite by a hydrochloric acid method has the advantages of having fast leaching speed, strong capability of impurity removal, high leaching and recovery rate of theNiCo, and wide application on the resources, furthest protecting the environment because a closed circulation without discharging outwards is formed, satisfying the requirement of volume production and industrialization based on the technique and the equipment of the process under the condition of less investment on unit metal consumption, having a concise and low cost process flow, simultaneouslyharvesting the additional valuable product such as an iron and magnesium resource with high comprehensive utilization rate of ores, possessing of the economy and environment protection benefit whichis superior to the prior art, and adopting the hydrochloric acid method to be as an optimal method to extract the NiCo from the hartmanite when taking account of the low grade of the hartmanite and the complication status of Ni occurrence.