The Central Committee of the Korean Workers Party will convene the meeting on Friday, according to the official Korean news agency of the North.
It is said to be "the political issues of a new stage in line with the requirement of an important historical period of the developing Korean revolution," it said.
The report did not raise any political issues for discussion, but the timing of the meeting attracted much attention.
Kim Jong-un, leader of the North, will meet with South Korean President Moon Jae next Friday, followed by a summit with US President Donald Trump in May or early June.
Trump said talks were ongoing on the date and place, adding that the two parties are also conducting negotiations for the release of the three Americans captured in the north.
Mike Pompeo, his new foreign minister, met with him the leader of the North during his trip to North Korea over the Easter weekend. Trump tweeted, the two formed a "good relationship".
In the plenary session of the WPK, the members and deputy members of the Central Committee discuss and approve important political lines and personnel redeployment.
Kim's signature policy at both nuclear and economic development, commonly known as "byongjin" policy, was adopted at the WPK plenary in March 2013.
The upcoming session comes about a week after the North Korean leader presided over the WPK's Politburo meeting and the party's future policy set forth international relations before its summits with Moon and Trump. (Yonhap)