English Romantic movement was both a revival and a revolt. It was a revival of Elizabethan romance, imagination, love for nature, and the beauty. And it was a revolt against the classicism or neo-classicism of the 18th century.
The Romantic poets reacted against the style of the 18th century.
The 18th-century poet used simile, metaphor, allusion, and other poetic diction like heroic couplet in their poetry. As a result, their poetry was artificial.
On the other hand, romantic poets used simple language in their poetry so that common people maybe understand and get pleasure. Poets must not use poetic diction.
The 18th-century poets wrote about upper-class Society, fashionable life, artistic drawing-room. But Wordsworth and his followers wrote about common people and ordinary objects of nature.
Therefore, to the 18th-century poets, nature means human nature, the feeling of sorrow and suffering,but to the romantic poets, nature means the world of leaves, trees, flowers, seas, hills, forest, etc.
Thus, the Romanticism revolted against the 18th-century poets and their poetry.