In his statement read out on a state-run NBT TV channel, Thaksin said he and his family will remain in exile in England indefinitely and did not say when he would return to the country.
He accused the country's legal system of employing "double standard" in their proceeding with legal matters against him and his family.
The former premier said he and his family have repeatedly received death threats and that they had to travel in bullet-proof cars.
Thaksin said at first he thought the election result of February 23, which saw the People Power Party (PPP), many of whose members came from his now defunct Thai Rak Thai Party, came out victoriously would help "improve the situation".
Therefore he decided to return to Thailand on February 28, thinking that the situation would be favourable and "permits me to prove my innocence."
"But the situation has worsened. What has happened to me is like a poisoned fruits that came from a poisoned tree," Thaksin said.
He claimed there were "intervention in judicial system" that originated from intervention by dictatorship who has hidden agenda to "get rid of me and my family".
"These individuals see me as political enemy. They have no consideration to judicial system, truth and legal principle."
"My family and I have been continuously treated unjustly.
Thaksin apologised to his supporters for having to go into exile and asked them to remain committed to him.
"These are all results of my tireless effort to help the country. I apologise for having to seek relocation to England. I ask that all my supporters to remain with me a bit longer," Thaksin said.
Thaksin said he revealed the whole truth at an appropriate time, saying "Today is not my day."
Thaksin said he and his family remain loyal to the Monarchy "even though some have tried to accuse me of being other wise."
"I may be not a perfect man but I reaffirm that I am not as bad as some accused of being. If good fortune were on my side I would like to return to Thailand and die there like all other Thai people.
It was not clear if Thaksin will seek political asylum in the United Kingdom where he owns the Manchester City football club