A shockproof nut kit includes an upper nut and a lower nut, in which an end surface of the upper nut is provided with a boss of elliptic cylinder; on the upper end surface of the elliptic cylinder at a longer planar extension side is provided an unfilled corner; in an end surface of the lower nut is concavely formed a cylindrical groove matching with the boss of elliptic cylinder, and in the assembly state, the boss of elliptic cylinder on the upper nut is in clearance fit with the cylindrical groove in the lower nut. The present invention avoids the slipping and displacement of nuts in the meshing process, and ensures the coaxiality of the upper and lower nuts during installation to the utmost. In terms of both safety and shockproof, the present invention achieves satisfactory results, the installation thereof is convenient and reliable, and the disassembly thereof is simple.