Transport for London (TfL) is spending £54 million to convert Tottenham Hale "into a landmark station".
This includes £20 million from TfL's Unlocking New Growth Areas Fund and an undisclosed amount from the Mayor's Recovery Fund.
Improvements include wider ticket halls and new gates to reduce waiting times and allow more people to pass through the facility.
Since October, the body has been working to return Tottenham Hale Station to two-way traffic through removing the gyratory.
It will also form part of a wider development in the Lea Valley region, which TfL considers a "key area of growth" with plans for 20,100 new homes.
TfL has pledged £72 million to upgrade the Lea Valley main line, including £25 million from the London Enterprise Panel, that will allow a new service between Stratford and Angel Road to operate, providing four trains per hour. This will include stopping at Tottenham Hale Station, encouraging growth and use of the facility.