A new kind of high-power broadband Yb~(3+)-doped double-cladding photonic crystal fiber(DC-PCF) superfluorescent source(SFS) is reported experimentally,which is pumped at 976 nm by a high-power lasers diode(LD) with the end-coupling method.We get the smooth broadband superfluorescence.The maximum superfluorescent output power is 1.649 W with a slope efficiency of 56.7%.The 3 dB bandwidth is 22.4 nm.