Hexagonal boron nitride (h-BN) ceramics, as a type of high-performance structural-functional integrated composite ceramics material, have broad application prospects in aerospace, aviation, microelectronics, metallurgy, and other fields. However, due to the special layered structure and interlayer covalent bonds of h-BN, there are challenges in achieving density during the sintering process. In order to promote the densification of h-BN ceramics sintering and enhance their various properties, researchers have proposed new strategies based on traditional sintering techniques such as pressureless sintering (PLS), hot pressing sintering (HPS), spark plasma sintering (SPS), and reactive sintering (RS). Additionally, they have developed various new sintering technologies, including cold sintering (CSP), oscillating pressure sintering (OPS), and cross-linking pressureless bonding. This review comprehensively summarizes the recent advances in h-BN ceramics densification technology from the perspectives of both traditional and new sintering techniques. By comparing various traditional and new sintering technologies and combining them with typical applications of h-BN ceramics, it elucidates the development directions and application prospects of existing sintering technologies, aiming to provide references for the development and application of sintering densification technology for h-BN ceramics.