NOVELTY - Co-generating cracked bio-diesel and active carbon, comprises e.g. using asphalt plant, animal and plant grease or oils, saponins or various types of waste oil as raw materials, feeding the raw materials into a vacuum cracking tower through a feed pump, after cracking discharging the cracked light components in the form of gas from the outlet of the tower top into a condenser for condensing and liquefying, refluxing one part of the condensed liquid to the vacuum cracking tower from the tower top, feeding the other part to an esterification modifying reactor, and heating the heavy components.    USE - The method is useful for co-generating cracked bio-diesel and active carbon.    ADVANTAGE - The method is ecofriendly, do not produce waste material, and achieves low carbon energy saving.    DETAILED DESCRIPTION - Co-generating cracked bio-diesel and active carbon, comprises (i) using asphalt plant, animal and plant grease or oils, saponins or various types of waste oil as raw materials, feeding the raw materials into a vacuum cracking tower through a feed pump, where the operation pressure in the tower is 2-50 kPa, the operation temperature on the top of the tower is 80-200 degrees C, and the operation temperature of the tower reactor is 300-450 degrees C, after cracking discharging the cracked light components in the form of gas from the outlet of the tower top into a condenser for condensing and liquefying, refluxing one part of the condensed liquid to the vacuum cracking tower from the tower top based on the reflux ratio of 0.2-1, feeding the other part to an esterification modifying reactor, heating the heavy components of the tower reactor through a molten salt heat medium for cracking, boiling, and continuously extracting the carbonized asphalt at the tower bottom; (ii) feeding the components of tower top into the esterification modifying reactor, adding methanol as esterification agent, where the mass ratio of methanol to cracked product in reactor is (0.5-1.2): 1, adding acid catalyst, controlling the operation pressure in the reactor to be 0.3-1.2 MPa, and temperature at 110-145 degrees C, after reacting discharging the excessive methanol and water from the reaction system in a gaseous manner, where the excessive methanol is used circularly after being dehydrated and purified by the methanol recycling system, and the modified and stabilized cracked product enters the vacuum rectification tower for separating and purifying; and (iii) continuously feeding the modified and stabilized cracked product of step (ii) to an vacuum rectifying tower, controlling the operation pressure in the tower to 0.5-25 kPa, the tower top operation temperature at 80-180 degrees C, and the tower reactor operation temperature at 220-280 degrees C, condensing and liquefying the gaseous components at the tower top through the condenser, refluxing one part of the condensed liquid to the top of the vacuum rectifying tower based on the reflux ratio of 0.2-1, and using the other part as cracked bio-diesel product, re-boiling the tower reactor liquid through a molten salt or heat conducting oil, and returning the heavy ingredient extracted from the tower reactor to a vacuum cracking tower for recycling.