The invention relates to the technical field of barrel direct-discharge silencers, and discloses an elliptical barrel direct-discharge silencer capable of improving the power of a 5Kw unit generator. The elliptical barrel direct-discharge silencer comprises a shell, a front-end partition plate is welded to the top of the shell, an air inlet hole is formed in the inner wall of the front-end partition plate, a rear-end partition plate is welded to the bottom of the shell. An exhaust pipe is welded to the inner wall of the rear-end partition plate, an air inlet pipe is movably connected to the inner wall of the front-end partition plate, a first air inlet partition plate is welded to the inner wall of the shell, and a second air inlet partition plate is welded to the inner wall of the shell. The effective volume of cavities is increased, the power is better improved, the silencing effect is better improved, the volume ratio of all the cavities is optimized, the average airflow speed of the silencer is reduced, a vent pipe and the vent hole diameter are optimized, the exhaust smoothness of all the cavities is improved, the structure of the silencer shell is strengthened, sound radiation is reduced, flow guide and heat insulation of exhaust of the main air inlet pipe are achieved are solved, and the overall or large-area temperature of the silencer is prevented from being too high.