The 2018 World Junior Ice Hockey Championship Division II consisted of two tiered groups of six teams each: the fourth-tier Division II A and the fifth-tier Division II B. For each tier, the team which placed first was promoted to the next highest division, while the team which placed last was relegated to a lower division. The tournaments were a round-robin tournament format, with two points allotted for a win, one additional point for a regulation win, and one point for an overtime or game winning shots loss. To be eligible as a junior, a player couldn't be born earlier than 1998.