The invention discloses a long-service-life high-power energy-saving lamp which is composed of a lamp cap (1), a lamp base (2), a ballast (3) and a lamp tube (4); the lamp tube is composed of a glass tube (5) which is coated by fluorescent powder (6) and a cathode filament (7) coated by an electronic powder slurry (8) which is taken as the electron emission material; the long-service-life high-power energy-saving lamp adopts the ballast with the pre-heating function, the cathode electron emission material of the energy-saving lamp adopts the special electronic powder slurry for the super-long-service-life high-power energy-saving lamp as the electron emission material, thereby solving the shortcomings of rapid sputtering of the electronic powder, short service life and energy waste of thetraditional high-power energy-saving lamp, greatly improving the service life of the high-power energy-saving lamp and realizing the purposes of green lighting, conservation of resources, energy conservation and environmental protection.