Active in student government from a young age, Ahmed served as the General Secretary of the English Departmental Association of Dhaka University from 1974 to 1975. From 1979 to 1983, Bablu was a member of the Dhaka University Senate and from 1981 to 1983, he was the General Secretary of Bangladesh Chhatra League. During that time he also served as the General Secretary of
Dhaka University Central Students Union. Bablu was first elected as a
Member of Parliament (Bangladesh) to the
Jatiya Sangsad in 1988 from the
Chittagong-7 constituency. He was elected to his second term in Parliament from
Chittagong-9 in 2014. Bablu served as the Secretary General of the Jatiya Party from 2014 to 2016. He was appointed Special Assistant to chairperson of Jatiya Party Hussain Muhammed Ershad. In 2020, Bablu was nominated by the Jatiya Party to contest the elections in
Chittagong-8. The seat became vacant after the incumbent,
Moin Uddin Khan Badal, died. He withdrew his candidacy before the start of the election on instructions from his party. Subsequently,
Moslem Uddin Ahmad was elected to parliament from Chittagong-8 as a candidate of Awami League. From 2014 to 2016, Bablu served as the first General Secretary of the Jatiya Party while former President
Hussain Muhammad Ershad was chairman. On 26 July 2020 he was elected to a second term as Secretary General of the Jatiya Party. ==Personal life==