The warning came a day after Park denounced North Korean leader Kim Jong-Un for "playing a gamble to escalate tension" on the Korean peninsula.
The North's Committee for the Peaceful Reunification of Korea, responsible for inter-Korean ties, said Park had attempted to "bar the situation from leading to detente".
If Park continues to slander the North's leadership, she will face "a deadlier retaliation" than what her predecessor did, it said in a statement through state media.
Park had yesterday said that North Korea's new policy of pursuing economic construction and the building of nuclear force together would "never" succeed.
"What she uttered is nothing but a reckless provocation made by a mentally deranged person bereft of reason and face," it said.
The North, angered by United Nations sanctions sparked by its nuclear test in February and joint South-US military drills, has stoked tensions for months with blistering threats of nuclear war against Seoul and Washington.
But friction has appeared to ebb since North Korea moved medium-range missiles off their launch sites.
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