In 1904 his family moved again in Sofia and rent an apartment at 46 Oborishte str. Debelianov graduated in 1906, and for some time he was a student at law (1907-1908) and literature in Sofia University. He worked in the Central Meteorology station, also as a scenographer in the National Assembly and in Sofia Municipality. He was a journalist at "Day"and "Balkan tribune" newspapers as well.
He was selected to take part in The Balkan War as an ordinary soldier. In 1914 he graduated The Soldiers academy in Kniazhevo (today's district of Sofia) and he was employed at the Bulgarian National Audit Office. In 1916 during WWI he was a volunteer in the Southern front.
He lost his life on 2nd of October 1916 near Demirhisar as a company commander. The next day he was buried in the backyard of the Bulgarian church in Demirhisar. In 1931 after a suggestion of the literature circle "Live word" his relics were moved and reburied in his hometown Koprivshtitsa. Later the sculptor Ivan Lazarov made a tombstone.
Debelianov was writing his poems since his school years. His idols were Pencho Slaveikov and Peyo Yavorov. He published his poetry in many magazines such as "Contemporaneity", "Bulgarian gathering", "Modern thought", "Artistical culture", "Zveno" and etc. He also wrote humorous poems in magazines "Drum", "Wasp", "Laughter" and etc. His lyrics are bright, confessional, influenced by the symbolism and ethical problems. He created elegies, inspired by desire of spiritual harmony and romantic dreams.
Debelianov is one of the best creators of the Bulgarian verse - "Plovdiv", "Hidden whispers", "Coming to my father's house" and etc. He made translations in Russian and French.
In his memory 134 Secondary school at Pirotska str. was named after him.