The invention discloses a crude oil reduced pressure distillation method for eliminating a choke point in a pressure reduction process. The method comprises the following steps: firstly, performing heat exchange on atmospheric pressure residual oil through an atmospheric pressure furnace convection section and a reduced pressure furnace convection section, raising the temperature by 5-20 DEG C, then feeding the residual oil into a reduced pressure flash column, operating the reduced pressure flash column at 5-30kPa, at the same time, introducing reduced pressure flash column light lube oil as washing oil from the upper part of a reduced pressure distillation column, performing heat exchange on a gas on the top of the reduced pressure flash column, condensing, cooling and directly extracting the gas as a product, extracting the washing oil in the middle of the reduced pressure flash column, feeding the washing oil below a light lube oil extracting plate of the reduced pressure flash column, feeding the flash base oil of the reduced pressure flash column into a reduced pressure furnace, heating to be 370-410 DEG C, feeding into the reduced pressure distillation column through an oil transfer line, performing reduced pressure fractionation, and then extracting products of different fractions from a side line of the reduced pressure distillation column. The method improves the crude oil reduced pressure distillation process, eliminates the choke points of the reduced pressure furnace and the reduced pressure distillation column, reduces energy consumption, improves the treatment capacity and increases the economic benefits of a device.