The invention discloses a hedgehog-like carbon nanosphere and a preparation method and application thereof. The hedgehog-like carbon nanosphere includes carbon nano particles and a plurality of carbon thorns growing on the carbon nano particle surface, the carbon nano particles and the carbon thorns make the carbon nanosphere hedgehog-like. The preparation method of the carbon nanosphere comprises the steps of empty reaction vacuumization and introduction of a protective gas. Due to growth of the plurality of carbon thorns on the carbon nano particle surface, the carbon nanosphere is hedgehog-like, has a rich surface and a large surface area, and is uniform in particle size. The preparation method has the advantages of simple process, easy control and high production efficiency.