Prof Sadhu Singh was born in the village of Manuke Gill in Moga District in 1941. He joined the irrigation department as a draughtsman in Chandigarh in 1961. He continued his studies and was awarded a M.A. degree in English from Punjab University Chandigarh in 1970.
He was selected by Punjab Public Service Commission as a College Lecturer in English in 1970. He served at Government Brijindra College Faridkot from 1971 to 1999 as Lecturer in English and worked for College Lecturer Association (G.C.L.A.) Punjab. After retirement in 1999, he worked as Principal in K. K. Marwah Girls College Faridkot.
Singh has authored two books of Punjabi poetry, Pyasi Mehak and Saleeb Te Sargam and has been associated with numerous literary and cultural Sabhas and Kendri Punjabi Lekhak Sabh