The invention relates to a method for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil. According to the method, active carbon, an oxide or a metal modified material is used as an adsorbent; diesel oil is firstly pretreated for adsorption removal of trace impurities; the diesel oil with impurities removed is introduced into multi-tower parallel connected adsorption equipment for adsorption separation of polycyclic aromatic hydrocarbons in the diesel oil, and simultaneously a desorbent is introduced; and through periodical switching of feed and discharge valves, the adsorption towers alternately carry out adsorption-regeneration to realize semi-continuous operation of adsorption-regeneration, so as to obtain desorbent-containing refined diesel component and polycyclic aromatic hydrocarbon components. As boiling points of the desorbent and the diesel component are quite different, a rectifying tower can be utilized to realize separation and recycling of the desorbent, and the refined diesel and polycyclic aromatic hydrocarbons are obtained. The technology for multi-tower parallel connected adsorption removal of polycyclic aromatic hydrocarbons in diesel oil has characteristics of low operation temperature, low pressure and continuous operation. In addition, the adsorption technology has strong capability of removing polycyclic aromatic hydrocarbons in diesel oil, and removal rate of polycyclic aromatic hydrocarbons can reach 80%.