The invention discloses a preparation method of a novel composite bulletproof inserting plate. The preparation method comprises the steps that 1, a titanium alloy plate or a titanium plate is stampedinto a multi-curved plate to serve as a bullet-facing panel, and the titanium plate is stamped into the multi-curved plate to serve as a back plate; 2, aramid fiber cloth is cut into aramid fiber cloth pieces; 3, ultra-high molecular weight polyethylene prepreg is pressed into a polyethylene plate; 4, the aramid fiber cloth pieces are adhered to the convex surface of the polyethylene plate to forman aramid fiber cloth piece transition layer, ceramic is adhered to the aramid fiber cloth piece transition layer, then the aramid fiber cloth pieces are taken and adhered to the ceramic to form an aramid fiber cloth piece anti-cracking layer, and the polyethylene plate is solidified to obtain an inner core; and 5, the inner core is placed in the back plate, and the bullet-facing panel is sealedon the back plate, vacuumizing, welding and sealing are conducted, and then the bullet-proof inserting plate is obtained. According to the preparation method, the bullet-facing panel and the back plate are vacuumized and sealed, a waterproof, ultraviolet-proof, corrosion-resistant and oxidation-resistant enclosed protective space is formed around the inner core, erosion of sunlight and a humid environment to the aramid fiber, the ceramic and the ultra-high molecular weight polyethylene material of the inner core are avoided, and the service life of the bulletproof inserting plate is greatly prolonged.