A production method of a solid fiber mulching mat from a non-woody fiber is disclosed. The method includes the steps of providing a biopulp from a non-woody fiber plant, a polymer and a water; mixing the biopulp, the polymer and the water for preparing a liquid fiber pulp of the non-woody fiber plant; spreading the liquid fiber pulp of the non-woody fiber plant; extruding and dehydrating the liquid fiber pulp; and drying the liquid fiber pulp so as to form the solid fiber mulching mat.