The Ever Ace docked in Felixstowe, Suffolk, early on Sunday morning on her maiden voyage.
The 400m-long (1,300ft) ship has a capacity of 23,992 containers, which is slightly more than other, similar-sized vessels.
She is due to leave for Rotterdam on Wednesday before she crosses the Suez Canal, which was blocked by her sister ship in March.
The Ever Given ran aground earlier this year and was stuck in Egypt for nearly a week, causing disruption to global shipping, before itself arriving at the Suffolk port last month.
The Ever Ace is the first in a planned series of 12 supersized container ships to be built for Taiwanese company Evergreen Marine.
The Ever Ace arrived at the Suffolk port after setting off from China in August
* Length: 400m (1,300ft)
* Width: 61.5m (202ft)
* Cruising speed: 22.6 knots
* Maximum capacity: 23,992 containers
* Built: 2021
Felixstowe is no stranger to big ships, having welcomed the MSC Gulson two years ago, which is almost identical in size to the Ever Ace but said to carry 28 fewer containers.
The latest giant arrival docked in Suffolk from Hamburg after leaving China in August.