This line for collection, processing of oil sludges and rendering safe of earths (soils), comprising plants (1,2,3,4,5,6,7,8) for the collection, separation, conversion of oil sludges in which are mounted pumps (17,23,25,36,37,58) , intake units (41,42,43,44,45), thermal settlers (16), coarse and fine purification filters (59,60), mixers (55), a hydrocyclone, a centrifuge (56), separators (62,63,64) and demulsifier feeders (53,54): has a plant (3) for collection and pumping over bottom residue; a plant (4) for purification of water sludge suspension and cultivation of biological strains; plant (11) for the complex purification of earths by aerobic and anaerobic microorganisms; plant (12) for biomass utilisation and plant (4), for separation of oil sludge and bottom residue, which has a unit (39) for discharge of water sludge suspension.    Here the plant (13) for collection and pumping over the bottom residue has a rotatable frame (26) with rotatable boom of variable geometry, unit (27) for washing of the bottom residue by water with a mechanism (27) for regulation of washing intensity and on the rotatable frame (26) are mounted mechanisms for rotation (29), raising (30,31) of the beam and collection pump (25) for pumping over of the bottom residue.    Plant (5,7), for purification of water sludge suspension and cultivation of biological strains, has: nutrient inlet units (41,42); vessel (40) for treatment of water sludge suspension and cultivation of biological strains which has water sludge suspension inlet units (43); steam inlet (45); compressed air inlet (44); discharge (46) for purified water and discharge (47) of water sludge suspension together with microorganisms.    Plant (11) for complex purification of earths by aerobic and anaerobic microorganisms has units for: inlet of nutrients (67,68); a vessel (66) for treatment of earths which have units for reception of earths (69), inlet (70) of water-sludge suspension with microorganisms, inlet (71) of compressed air, stirring (72) and discharge of earths, biomass utilisation plant (12) with units for inlet (75,76) of nutrient additives, vessel (74) for treatment of earths which has units for reception of earths (77), discharge of mycelial biomass, stirring (78) and discharge of earths which have been rendered harmless.    USE -   In the oil converting industry especially for the processing of oil sludges and rendering harmless of earths.    ADVANTAGE -   Ensures the gathering of bottom sludge of large sludge accumulators, increases the level of purification of oil products and water obtained during the conversion of oil sludges ensuring the rendering safe of sludges, reduces capital costs for building the line, increases the level of rendering safe of wastes and earths. Reduces possible disruptions of the balance of the bioflora by the action of bred microorganisms the number of which exceed the natural background levels by a million times.