The invention discloses a sun shield sliding block and a machining method of the sun shield sliding block. The sun shield sliding block comprises a sun shield sliding block body, an arched transverse elastic body, an arched longitudinal elastic body and an arched metal leaf spring. The sun shield sliding block is characterized in that a transverse elastic body limiting groove used for limiting the arched transverse elastic body is formed in the side wall of the sun shield sliding block body, a longitudinal elastic body limiting groove used for limiting the arched longitudinal elastic body and a metal leaf spring limiting groove used for limiting the arched metal leaf spring are symmetrically formed in the positions, close to the side wall, of the upper portion of the sun shield sliding block body respectively, and the longitudinal elastic body limiting groove and the metal leaf spring limiting groove are inwards formed in the upper portion of the sun shield sliding block body in sequence. According to the sun shield sliding block and the machining method of the sun shield sliding block, the dual-injection-molding forming method is adopted, different injection molding materials are selected for different structures, and thus the overall structural strength is guaranteed; meanwhile, due to the elasticity of the partial structures, deformation noise is lowered fundamentally.