The invention discloses a painless lancet. The painless lancet comprises a rack and a lancet body; the elastic acceleration of a leaf spring is increased to greatly reduce the time of the lancet body staying on the fingertip, and thus people cannot feel pain basically; the top end of the leaf spring is pre-tensioned, a fixed lancet clamp is used for clamping a one-off lancet, a clamping switch releases the leaf spring, and the depth of inserting into the fingertip is adjusted through a lancet pad in order to prevent from repeatedly inserting into the fingertip. With the adoption of the painless lancet, the pain of picking blood can be relieved, the one-off material can be reduced, and therefore, the cost can be decreased.