The invention belongs to the field of filters, and in particular relates to a double-drum paper filter core filter. The double-drum paper filter core filter comprises two filter drums and a change-over valve between the two filter drums, and is characterized in that: the change-over valve is provided with an oil adjusting valve; and an oil adjusting passage is formed on the change-over valve corresponding to the oil adjusting valve. By arranging the oil adjusting valve on the change-over valve of the filter, oil can be gently replenished into the filter drum of a single filter core after the filter core is cleaned, so the conditions of oil reflow and negative pressure formation are avoided during normal work, the filter causes less interference on a system during the conveying of a filtermedium, and the impact of the reflowed oil on a paper filter core is avoided to prevent deformation or cracking of the paper filter core; and a groove is formed on the back part of the change-over valve and the oil flows into the groove on the back part of the change-over valve through the oil adjusting valve to balance stressing of the change-over valve during work, so that the friction of the change-over valve is relieved, the change-over valve rotates more lightly and smoothly and the service life of the change-over valve is prolonged.