The North Korean leader said the tests on the unspecified war tech was successful, state media reported on Friday.
It has been deemed a bid to apply pressure on the United States and South Korea amid their nuclear stalemate.
The tests did not appear to be for a nuclear device or a long-range missiles targeting the mainland US.
Korea hasn't publicly tested any weapons since November of last year, but in recent days Pyongyang expressed anger at US sanctions and South Korean military drills.
Earlier this month, North Korea's Foreign Ministry warned it could bolster its nuclear arsenal if it doesn't receive sanctions relief.
"He's tiptoeing towards a more aggressive posture in negotiations with the US Josh Pollack, senior research associate at the Middlebury Institute of International Studies at Monterrey, told CNN.
"He's signalling that he's not going to give way and can simply return to his old practices if the US don't change their approach.
Experts believe the weapon could be a missile, artillery, an anti-air gun or a drone.
Yang Wook, a Seoul-based military expert, said a "tactical weapon" in North Korea refers to "a weapon aimed at striking South Korea including US military bases".
It's the first publicly known weapons test by Kim Jong-un since he watched the testing of the Hwasong-15 intercontinental ballistic missile in November of last year.
The North said the test took place at the Academy of National Defense Science and that Kim couldn't suppress his "passionate joy" at its success.
He was described as "so excited to say that another great work was done by the defence scientists."
The North said this new, unspecified weapon has been under development for a long time and will help strengthen the combat power of its army.
Last year's string of increasingly powerful weapons tests, many experts believe, put the North on the brink of nuclear war.
Diplomacy has stalled since a June summit between President Donald Trump and Kim in Singapore.
Washington is pushing for total nuclear disarmament and the North wants the US to approve a peace declaration formally ending the Korean War.
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