She represents the Mughalsarai constituency in Chandauli district of Uttar Pradesh.
[1][2] Sadhana Singh contested Uttar Pradesh Assembly Election as Bharatiya Janata Party candidate and defeated her close contestant Babulal from Samajwadi Party with a margin of 13,243 votes.
She started her political career from BJP in 1993, after that she worked on many posts within the party.
She was MLA from Mughalsarai (Deendayal Upadhyay Nagar) Chandauli.
She is also the president of Jila Udyog Vyapar Mandal Chandauli Uttar Pradesh.