The invention relates to a liquid-phase hydrogenation device and method, in particular to a continuous liquid-phase hydrogenation device and method adopting a structure that an up reactor and a down reactor are connected in series and having no product cycle. According to the liquid-phase hydrogenation device and method disclosed by the invention, the up reactor and the down reactor are connected in series, n catalyst bed layers and 2n-2 hydrogen supply points are respectively arranged in the up reactor and the down reactor and are used for processing raw materials with low hydrogen consumption and canceling the product cycle; at least one micropore hydrogen dissolving distributor for dispersing hydrogen into microbubbles is arranged in each catalyst bed layer, and a multi-point quantitative hydrogen supplying mode is carried out, so that a gas-liquid contact surface can be uniformly and effectively increased, the reaction is promoted and hydrogenation efficiency is improved. Meanwhile, a distance space between every two catalyst bed layers is shortened by not less than 50%, so that the aim of improving utilization efficiency of the reactors is fulfilled.