The anniversary of the nation being founded is on September 9, but events are set to be held throughout the year to mark the occasion.
In a style that is typical for the hermit kingdom, the posters feature images of peasants waving banners and of workers posing heroically.
They also display members of North Korea’s armed forces on the offensive, with missiles as the backdrop.
The release of the posters has come as Kim Jong-un in his New Year address emphasised that North Korea has no intention of giving up its nuclear weapons.
The state-run Korea Central News Agency (KCNA) said the seven posted that were released “reflect the joy and excitement of the Korean army and people, who will mark the 70th birthday of the DPRK with splendour”.
KCNA said: “Some posters call for turning out in the struggle to frustrate the last-ditch challenges of the hostile forces and put the overall national power of the DPRK on a new stage of development by launching an all-people general offensive under the leadership of the Workers’ Party of Korea.”
News of the posters has come after North Korea earlier this week also spread propaganda by issuing a new set of stamps.
The stamps boast about North Korea’s nuclear weapons arsenal and also pledge an immediate counterattack, as tensions between Kim Jong-un’s isolated regime and the US intensify.
One red stamp depicts Kim making his New Year’s speech, when the communist dictator pledged to continue his widely condemned nuclear missile programme.
Another design features mobile missile launchers and carries the words “immediate counterattack” and “mass production of nuclear warheads and ballistic rockets”.
The words are quoting a section of Kim’s speech when he called for increased weapons production so that the North is ready to strike back against “the enemy’s manoeuvres for a nuclear war”.
The stamp of Kim giving his speech calls for “a new victory on all fronts of building a socialist power with revolutionary gunfire”.
Other stamps brag about the economy, hailing advances in construction and the carbon and chemical industries.