A picosecond pulse fiber front end based on a narrow-band dissipative soliton Figure-9 fiber oscillator and a single-stage single-mode fiber amplifier is reported here. By optimizing the fiber length of the fiber oscillator cavity, a self-starting single pulse mode-locked narrow-band dissipative soliton picosecond pulse with a center wavelength of about 1064 nm, a repetition rate of 10 MHz, and a pulse energy of 0.4 nJ is obtained. Then the 21.07 ps picosecond pulse generated by the fiber oscillator is amplified by a single-stage single-mode fiber amplifier, and the spectrum can still maintain a bell-shaped structure with a 3 dB spectral width of 0.31 nm and a pulse width of 19.8 ps, respectively, even the pulse energy reaches 10 nJ. The picosecond fiber front end is expected to play an important role in precision machining and other fields.