"The Prime Minister's remarks comparing Kerala and Somalia will result in both him and BJP getting a 'shock treatment' in the hustings," he told reporters at Kollam.
Modi had compared the infant mortality rate among tribals in the state with that of African country Somalia during the poll campaign rally earlier this week, triggering widespread criticism among political parties in Kerala.
Antony also attacked the CPI(M)-led LDF, saying it will have to sit in the opposition for another five years.
Alleging that the Prime Minister was 'cheating' the state with his promises, Antony said that after the Puttingal temple tragedy at Kollam, in which 109 persons were killed and several others injured, Kerala's only plea had been to declare the mishap as a national disaster, which was not considered.
He said if the ruling congress headed UDF was given a chance to govern the state for another five years, it would take up peoples' welfare, development and education matters in such a way that Kerala will become the number one state in the country.