Abstract: Supercontinuum has a wide and important application in many fields, it is one of the hottest research topics during the past four decade. However, the splicing and coupling loss is a little high owing to the mismatch of mode area between double-clad fiber and photonic crystal fiber and the maximum average output power of the supercontinuum is 50 W due to limited average output power available of ultrafast fiber lasers with high quality. In this paper, a 70 W supercontinuum generation is constructed which not only overcomes the problem of high splicing and coupling loss between fiber and photonic crystal fiber caused by the mismatch of mode area, but also relaxes the spectral requirement for the pumping fiber laser sources.