The invention relates to a checking calculation method of the auxiliary spring working load of non-end-part contact-type double-strengthened few-piece main and auxiliary springs, and belongs to the technical field of the suspension steel plate spring. Firstly, the end point deformation coefficient G and the half rigidity K of each piece of main spring as well as the deformation coefficient G of the Nth piece of main spring on the contact point of a parabolic segment and the auxiliary spring can be determined according to the structure size and the elasticity modulus of each piece of an end-part and root-part double-strengthened main spring with a variable cross section; and subsequently, according to the half rigidity K of each piece of main spring, the deformation coefficient G and the thickness h2 of the root part straight section of the Nth piece of main spring and a main and auxiliary spring interval design value [Delta], carrying out checking calculation on the auxiliary spring working load. Through simulation verification, by use of the method, the accurate and reliable checking calculation value of the auxiliary spring working load of the non-end-part contact-type double-strengthened few-piece main and auxiliary springs with the variable cross sections can be obtained so as to improve product design levels and vehicle smoothness. Meanwhile, design and experiment cost is lowered, and a product development speed is increased.