The invention discloses a hazelnut chocolate-flavored leisure food and a preparation method thereof. The hazelnut chocolate-flavored leisure food comprises a puffed green body and a wrapping slurry wrapping the puffed green body, wherein the puffed green body is prepared by mixing rice flour, corn flour, wheat flour, a cocoa product A, a swelling agent and water A according to a specific formula and then carrying out extrusion and puffing treatment; and the wrapping slurry is prepared by mixing white granulated sugar, edible salt, a cocoa product B, a dairy product, a hazelnut product, grease,a stabilizer, water B and essence according to a specific formula and then carrying out batch feeding and stirring. According to the invention, the puffed green body and the wrapping slurry are innovatively combined, so the leisure food has the characteristics of rich and smooth fragrance, unique and harmonious flavor, loose taste, good chewing feeling, no tooth sticking and the like; and the wrapping slurry is in a uniform and consistent stable state, so when the wrapping slurry is combined with the puffed green body, the cocoa fragrance and chocolate flavor of the product are explosively enhanced, and uniform appearance and good crispness of the product are ensured.