This manuscript demonstrates a kilo-watt level, spectrum programmable, multi-wavelength fiber laser (MWFL) with wavelength, interval, and intensity tunability. The central wavelength tuning range is 1060~1095 nm and the tunable number is controllable from 1 to 5. The wavelength interval can be tuned from 6 to 32 nm and the intensity of each channel can be adjusted independently. Maximum output power up to ~1100 W has been achieved by the MOPA (Master Oscillator Power Amplifier) structures. We also investigate the wavelength evolution experimentally considering the difference of gain competition, which may give a primary reference for kW-level high-power MWFL spectral manipulation. To the best of our knowledge, this is the highest output power ever reported for a programmable MWFL. Benefiting from its high power and flexible spectral manipulability, the proposed MWFL has great potential in versatile applications such as nonlinear frequency conversion, spectroscopy, and so on.