A preparing method of a soft carbon graphite composite anode material is provided. The method includes S1) a step of mixing natural spherical graphite and asphalt, heating and dipping under a preset pressure after fully mixing to allow the asphalt to be softened and to flow into and fill inner pores of the natural spherical graphite, and cooling to obtain an intermediate, and S2) a step of carbonizing the intermediate, crushing and grading to obtain the composite anode material. According to the method, the asphalt is softened at a high temperature, flows into and fills the inner pores of the graphite particles and then carbonization is performed to obtain the composite anode material with excellent cyclic performance. The method is simple in process, low in cost and high in practicality. The soft carbon graphite composite anode material prepared by the method and a lithium ion battery applying the soft carbon graphite composite anode material are also provided.