The invention discloses a mounting structure for an internal battery of an electric vehicle and a using method of the mounting structure. The mounting structure comprises a fixed box body, a telescopic bottom plate and an elastic pressing strip, wherein the elastic pressing strip is composed of a spring ring, limiting side buckles, a limiting top plate and an elastic inner strip; the limiting sidebuckles are fixedly arranged on the outer surfaces of the two sides of the elastic pressing strip; the limiting top plate is fixedly arranged at the upper part of the elastic pressing strip, and thespring ring is fixedly arranged between the limiting top plate and the elastic pressing strip; the limiting top plate and the spring ring are in butt joint fixation through butt joint bottom bolts; the telescopic bottom plate is fixedly arranged on the outer surface of the lower end of the fixed box body; and a telescopic inner plate is movably arranged on the inner surface of the inner side of the telescopic bottom plate. The invention provides the mounting structure for the internal battery of the electric vehicle and the using method of the mounting structure, so that the mounting structurehas a telescopic adjusting function, the use range of the structure is expanded, and meanwhile, the mounting operation of the battery is more convenient, the stability of the battery is improved, andthe service life of the battery is effectively prolonged.