Tsang has spoken highly of wong's selfless and heroic deeds, dubbing him "a good example for all Hong Kong people" in one of his recent blogs.
Chief Secretary Hengry Tang also said earlier that Wong's selfless sacrifice reflected the spirit of Hong Kong and deserved the highest respect.
In 2002, it took Wong seven months to complete a walk from Hong Kong to Beijing to raise funds for the Chinese Marrow Donor Program, to which he had donated all his savings.
Following the 8.0-magnitude earthquake that hit southwestern China's Sichuan province in May 2008, Wong was hurried to the quake-stricken areas and worked as a volunteer for two months.
Since the beginning of last month, Wong had been serving in an orphanage in Yushu, Qinghai before the deadly earthquake, which had killed over 2,000 people and injured more than 12,000 others.
Wong Fuk-wing, who had been unknown to most Hong Kong people, let alone people in Chinese mainland, has become a household name now as media outlets in Hong Kong and the Chinese mainland dedicated much coverage to him.
Draped with HKSAR flag, Wong's coffin was flied back to Hong Kong on April 18.
His family joined a private memorial service on Thursday evening. The fallen hero will be laid to rest on Friday morning.