The invention relates to a die used for injection pultrusion and an injection pultrusion process for epoxy resin, which belong to the technical field of epoxy resin injection. The die used for injection pultrusion, which can increase the fiber mechanical properties and has advantages of high resin utilization rate, and the injection pultrusion process for epoxy resin. The die comprises an outer injection die, an inner injection die is arranged in the outer injection die, a structure is characterized in that a first taper cavity is arranged between the inner injection die and the outer injection die; a front circumferential direction of the inner injection die is connected with the outer injection die, a transverse through hole is arranged on the circumferential connection part; an opening is arranged at the central part of the inner injection die along the length direction, a front part of the opening is in a cylindrical shape, a rear part of the opening is in a taper shape, and the front end of the opening is communicated with the front end of the first taper cavity.