A kind of safe and convenient disposable blood-taking needle with double-surface cap, comprising lancet body with needle tip, lancet handle and lancet cap. The lancet body is fixed inside the lancet handle and the needle tip extends out of the first end of lancet handle to be inserted into the lancet cap, wherein: the body of above described lancet cap is a block structure, which includes a first face and second face. Both first face and second face are flat and opposed such that when one face faces upwards, the other face faces downwards and the included angle between them in space is less than 45°； the first face is provided with first blind hole and second face is provided with second blind hole and both first blind hole and second blind hole match the first end of lancet handle in respect of connection relationship. In the above described block structure, except the first face and second face, the other external surfaces are arcuate faces protruding outward and/or angular faces protruding outward. The present invention is especially suitable for domestic care where dedicated sharps disposal is absent, as it could conveniently and effectively prevent the risk of potentially contaminated needle stick during insertion of the used needle tip into a protective lancet cap.
