The 15-year-old reached the landmark off only 323 balls in a local schools' tournament.
His epic innings was laced with 59 towering sixes and 129 fours, and he offered the opposition just four chances en route.
Dhanawade was representing Smt. KC Gandhi School (Kalyan) against Arya Gurukul School in the HT Bhandari Cup inter-school cricket tournament, organised by the Mumbai Cricket Association.
He was unbeaten on 1,009 when his team declared their innings at 1,465 for three.