During the reign of King Rama V, the Along Khon chedi was built in 1876. In 1881 a memorial stupa, housing a relic of Princess Sunanta Kumari, was commissioned by King Rama V.[1]
On 2 May 1975, the area was declared a national park as Khao Sa Bap National Park. On 29 September 1982, the park was renamed Namtok Phlio National Park.[1]