The utility model relates to a masrolar D hydrotreatment technical field discloses a masrolar D preprocessing device, and the device includes fibre membrane contact reaction unit, mix unit and hydrotreatment unit in advance. The utility model also discloses a masrolar D hydrotreatment system, this system includes masrolar D pretreatment of raw material device and main hydrogenated apparatus, hydrogenated unit, main hydrogenated apparatus, hydrogenated unit is used for carrying out hydrotreatment to the result of preprocessing device output. According to the utility model discloses a masrolar Dpreprocessing device can reduce metallic impurity and mechanical impurities's content in the masrolar D effectively, and the specially adapted carries out the preliminary treatment to the such raw materials inferior of residual oil to restrain the rising that residual oil fixed -bed hydrogenation reactor catalyst bed lamination is fallen effectively, prolong residual oil fixed -bed hydrogenationreactor's the cycle of operation that stabilizes, and improve the operational safety of device, reducing device's running cost.