The present invention relates to an optical fiber cable with improved waterproof performance comprising: at least one tensile members; optical fiber units including at least one optical fiber cores; at least one buffer tube surrounding the optical fiber units; sheath covering the buffer tube and the tensile member to form a outer jacket of the cable, wherein a waterproof yarn is inserted longitudinally in the buffer tube with the optical fiber unit, and the thickness of the waterproof yarn is from 300 to 3,000 deniers, and tensile strength of the waterproof yarn is from 3 N to 150 N, and elongation rate of the waterproof yarn is from 5% to 45%, and water absorption rate of the waterproof yarn is at least 20 g/g.By the optical fiber cable, improve waterproof performance can be improved, and by minimizing the tensile strength of the waterproof yarn, possibility of break can be reduced.