The invention provides a high-radiation LED filament. The high-radiation LED filament comprises a heat conduction substrate, a plurality of LED lamps connected in series are fixed on a first surface of the heat conduction substrate, a high-radiation material layer is formed on a second surface opposite to the first surface, and the high-radiation material layer and the second surface are connectedin a chemical bond manner. According to the high-radiation LED filament, an exposed surface of the heat conduction substrate forms the surface layers connected with the heat conduction substrate in the chemical bond manner through machining or the chemical and physical mode process, the surface layers have high heat radiation coefficients, the heat radiation becomes an effective heat radiation approach of the LED filament, the heat radiation capability of the filament is improved, and the filament is applicable to practical application of higher power.