The invention discloses a triaxial truss type high-speed servo robot. The triaxial truss type high-speed servo robot comprises a machine base, an electric control box, a slide gun barrel, a drawing beam, an arm bracket and an arm beam; the electric control box is arranged at one side of the slide gun barrel, and the slide gun barrel is erected on the machine base; the drawing beam is erected on the slide gun barrel, and the drawing beam is repeatedly glided along the length direction of the slide gun barrel; the drawing beam is a reversed-right-trapezoid shaped structure, and one end of the drawing beam closing to the middle of a trapezoid waist part is a hollow form; the arm beam is crossed through the hollow part of the drawing beam and vertically erected on the drawing beam through the arm bracket, and the arm bracket is repeatedly glided along the length direction of the drawing beam; meanwhile, the arm beam is vertically glided in turn along the arm bracket. By reducing the structure and weight of the drawing beam, the drawing beam can be rapidly moved on the slide gun barrel; meanwhile, the arm beam is vertically erected at the hollow place of the drawing beam, so that the space occupancy ratio is reduced, and thereby the rapid material picking is realized, the picking cycle is short, and the working efficiency of an injection molding machine is improved.