The invention relates to a lithium-ion battery silicon monoxide negative electrode material, and a preparation method and application thereof. A method for improving rate performance and cycle performance of the lithium-ion battery silicon monoxide negative electrode material includes the following steps: S1: crushing silicon monoxide to silicon monoxide particles having a particle size of 100 to800 nm; S2: after mixing the silicon monoxide particles, a conductive agent, an organic carbon source, and a solvent to obtain a slurry, performing granulation to obtain spherical silicon monoxide secondary particles having a particle size of 4 to 8 [mu]m; S3: pyrolyzing the silicon monoxide secondary particles; and S4: performing secondary coating on pyrolyzed silicon monoxide secondary particlesto obtain the silicon monoxide negative electrode material. In the invention, pulverization, secondary granulation, pyrolysis, and secondary coating processing are performed on the silicon monoxide,on the basis of retaining original first-time coulombic efficiency to a large extent, thereby shortening a lithium-ion diffusion path, improving lithium-ion conductivity, limiting lithium-ion volume expansion, and having better rate performance and cycle performance.