The invention discloses a screen printing auxiliary frame mechanism applied to a screen printing machine. The mechanism comprises climbing support plates capable of supporting the screen printing auxiliary frame mechanism; at least one pair of climbing support plates is provided; auxiliary frame fixed plates capable of moving up and down are arranged at the tops of the climbing support plates; a screen printing mechanism platform capable of absorbing products is arranged at the middle parts of the auxiliary frame fixed plates; power sources are arranged on two sides of the bottoms of the auxiliary frame fixed plates; limiting columns are respectively fixed on the left and right two sides of the front ends of the power sources; and linear bearings are respectively fixed on the left and right two sides of the power sources. The mechanical can automatically protect screen printing net plates and the products, provides a certain screen printing precision functions, guarantees the product quality qualification and the specification unification, accords with the standard production mode in modern society, and is excellent in development prospect.