The invention discloses a preparation method of a high density cold spraying metal / metal-based sedimentary body and an application thereof, which belongs to the technical field of material processing. The method comprises the following steps: 1)taking ceramic particles, cermet particles, fine metal or an alloy as shot blast particles; taking fine metal with a single component, the alloy, metal and a metal-based composite material, or, taking a mixture of two or more than two of fine metal, the alloy or an intermetallic compound as deposition material powder; and 2)employing a cold spraying technology for spraying a mixture of the shot blast particles and the deposition material powder on the surface of the matrix to prepare the high density cold spraying metal / metal-based sedimentary body. According to the method, obvious increasing of particle speed and deposition temperature is not required, operation is simple, the deposition body has more excellent conductivity, thermal conductivity, higher corrosion resistance, wear resistance and higher mechanical property, so that the deposition body can be used for preparing the coating with high conductivity, high heat conduction, high corrosion resistance and high wear resistance as well as high mechanical property workpiece.