He is the author of more than 20 novels. Most critics believe that Gabriel Miró's literary maturity begins with Las cerezas del cementerio (Cemetery cherries) (1910), whose plot revolves around the tragic love of the super-sensitive young man Félix Valdivia for an older woman (Beatriz) and presents—with an atmosphere of voluptuousness and lyrical intimism—the themes of eroticism, illness, and death.

In 1915 he published El abuelo del rey (The King's grandfather), a novel that tells the story of three generations of a tiny Levantine town, for the sake of presenting, and not without a little irony, the struggle between tradition and progress, the pressures of one’s environment, and above all, a meditation about time.

One year later, Figuras de la Pasión del Señor (Characters from Our Lord Passion) (1916–17) was published, formed by a series of scenes about the last days of Jesus. Also in 1917, Miró began his autobiographical-style works with Libro de Sigüenza (Sigüenza's book), in which Sigüenza is not only the heteronym or alter-ego of the author, but the author's own lyrical self, which gives unity to the scenes which comprise the book.

El humo dormido (The sleeping smoke) (1919) is one of his most personal books and contains various autobiographical moments. There the author mingles reflections on topics like childhood, life, death, friendship, innocence, imagination, faith and beauty. These are also the main topics of his literary works as a whole. In Años y leguas (Years and leagues) (1928) he again turns back to his character of Sigüenza as a protagonist, are of a similar nature.

In 1921, he finished two more books: El ángel, el molino, el caracol del faro (The angel, the mill, the lighthouse snail), a book of scenes, and the novel Nuestro padre San Daniel (Our father Saint Daniel), which is part of a series with El obispo leproso (The leprous bishop)(1926). Both play out in the Levantine city of Oleza, a reflection of Orihuela, in the last third of the 19th century. The city, submerged in lethargy, is seen as a microcosm of mysticism and sensuality, in which the characters debate between their natural inclinations and social repression, and intolerance and the religious resistance to progress to which they are submitted.