The invention discloses a crude oil and petroleum product dehydration device which comprises a flask, a separator, a condenser and a backflow device. The flash is an anti-bumping flask, the lower hemisphere of the anti-bumping flask is a metal part, the upper hemisphere of the anti-bumping flask is a macromolecule resin part and is provided with a two-path funnel connector, a thermometer insertion opening, an air blowing opening and a backflow connector, the two-path funnel connector is connected with a two-path funnel in an inserted mode, the two-path funnel is provided with a steam outlet and a condensate outlet, and the two-path funnel is sleeved with a condensation barrel. The condenser is connected to the condensation barrel in an inserted mode. The separator is a centrifugal separation pipe, the centrifugal separation pipe is provided with a condensate inlet, a water outlet and an organic liquid outlet, the condensate inlet is connected with a condensate outlet through a pipe, the organic liquid outlet is connected with the backflow device through a pipe, the backflow device is further provided with a backflow insertion pipe and an inert gas outlet, and the backflow insertion pipe is connected with the backflow connector in an inserted mode. The crude oil and petroleum product dehydration device is high in dehydration speed and high in dehydration efficiency.