A new type of high-power broadband superfluorescent source of Yb~(3+)-doped double-cladding photonic crystal fiber is reported experimentally, which is pumped at 976 nm by a high-power laser diode with the end-coupling method. We have obtained a smooth broadband output of superfluorescence. The maximum output power is 1.649 W with a slope efficiency of 56.7%. The 3 dB bandwidth is 22.4 nm.To the best of our knowledge,this is the first report about SFS with such high output power of 1.649 W. A new type of high-power broadband superfluorescent source of Yb ~ (3 +) - doped double-cladding photonic crystal fiber was reported experimentally, which is pumped at 976 nm by a high-power laser diode with the end-coupling method. The maximum output power is 1.649 W with a slope efficiency of 56.7%. The 3 dB bandwidth is 22.4 nm. To the best of our knowledge, this is the first report about SFS with such high output power of 1.649 W.