The invention provides a method for making a liquid ink gun, the liquid ink gun and printing equipment. The method comprises the steps that a pressure generating component is formed on a base; the first surface of the base is coated with resin adhesives, and a first adhesive layer is formed; gray exposure treatment is carried out on the first area in the first adhesive layer, and a trapezoidal common chamber is formed; exposure treatment is carried out on the second area in the first adhesive layer, and a pressure chamber is formed; spray hole plates are formed on the surfaces, away from the base, of the pressure chamber and the trapezoidal common chamber; a through ink supply hole is formed in the position, corresponding to the common chamber, of the second surface, opposite to the first surface, of the base. According to the method for making the liquid ink gun, the liquid ink gun and the printing equipment, the problem that according to an existing liquid ink gun, liquid ink is prone to flowing back to the ink supply hole, and printing speed is influenced can be solved, the problem that printing quality is lowered due to the fact that adhesives are adopted can be avoided, and the mechanical strength of the pressure chamber can be improved.