The deal, which is the most lucrative in the club's 136-year history, begins at the start of next season and remains the longest-running shirt sponsorship in the Premier League.
Everton have now worn the Chang brand for 10 seasons, previously renewing the partnership on four separate occasions in 2005, 2008, 2010.
Everton chief executive Robert Elstone, striker Arouna Kone and club legend Graeme Sharp were all in Thailand to sign the new arrangement at Bangkok's Plaza Athenee hotel.
Elston said: "Everton has enjoyed a special relationship with Chang extending now for 10 years.
"In that period, we have grown to understand one another, delivered great work, helped achieve objectives and developed a truly great partnership and, indeed a friendship, based on mutual trust, respect and affection.
"We do not take our partnership and all that we have achieved lightly. Everton is very proud of our mutual success to date."