A method for preparing a dental composite resin material, characterized in that it comprises: weighing each of raw materials, including an ethylenically unsaturated monomer, a reinforcing fiber, a filler, an initiator, an polymerization inhibitor and a colorant; wherein the ratio of the total weight of the reinforcing fiber and the filler to the weight of the ethylenically unsaturated monomer is 90:10-10:90, preferably 85:15-65:35; the initiator is 0.05-1%, preferably 0.1-0.3% by weight relative to the weight of the ethylenically unsaturated monomer; the polymerization inhibitor is 0.05-1%, preferably 0.1-0.3% by weight relative to the weight of the ethylenically unsaturated monomer; the colorant is 0.001-0.2%, preferably 0.005-0.1% by weight relative to the total weight of the ethylenically unsaturated monomer, the reinforcing fiber and the filler; and the weight ratio of the filler to the reinforcing fiber is 10:90-55:45; mixing the weighed raw materials except the reinforcing fiber, obtaining a composite resin monomer precursor; impregnating the weighed reinforcing fiber into the composite resin monomer precursor for 1-5 hours, preferably 2-3 hours, at an impregnation negative pressure of less than or equal to 0.1 MPa, obtaining a composite resin monomer precursor-immersed reinforcing fiber; and subjecting the composite resin monomer precursor-immersed reinforcing fiber to a solidification treatment, obtaining the dental composite resin material, wherein the solidification temperature is 100-200 °C, preferably 120-160 °C, the solidification time is 0.5-3 hours, preferably 1.5-2 hours, and the solidification pressure is 10-200 MPa, preferably 10-100 MPa, and more preferably 20-60 MPa. weighing each of raw materials, including an ethylenically unsaturated monomer, a reinforcing fiber, a filler, an initiator, an polymerization inhibitor and a colorant; wherein the ratio of the total weight of the reinforcing fiber and the filler to the weight of the ethylenically unsaturated monomer is 90:10-10:90, preferably 85:15-65:35; the initiator is 0.05-1%, preferably 0.1-0.3% by weight relative to the weight of the ethylenically unsaturated monomer; the polymerization inhibitor is 0.05-1%, preferably 0.1-0.3% by weight relative to the weight of the ethylenically unsaturated monomer; the colorant is 0.001-0.2%, preferably 0.005-0.1% by weight relative to the total weight of the ethylenically unsaturated monomer, the reinforcing fiber and the filler; and the weight ratio of the filler to the reinforcing fiber is 10:90-55:45; mixing the weighed raw materials except the reinforcing fiber, obtaining a composite resin monomer precursor; impregnating the weighed reinforcing fiber into the composite resin monomer precursor for 1-5 hours, preferably 2-3 hours, at an impregnation negative pressure of less than or equal to 0.1 MPa, obtaining a composite resin monomer precursor-immersed reinforcing fiber; and subjecting the composite resin monomer precursor-immersed reinforcing fiber to a solidification treatment, obtaining the dental composite resin material, wherein the solidification temperature is 100-200 °C, preferably 120-160 °C, the solidification time is 0.5-3 hours, preferably 1.5-2 hours, and the solidification pressure is 10-200 MPa, preferably 10-100 MPa, and more preferably 20-60 MPa.