An industrial plant for the thermochemical treatment of biomass which operates under anoxic or almost anoxic conditions and provided for working continuously, including: • a cylindrical thermochemical reaction chamber demarcated by a cylindrical wall and by a first closed end and a second closed end, defining an inner diameter and an axial length of the chamber; • thermal insulation arranged around said thermochemical reaction chamber, surrounding it; • a biomass inlet provided in a position adjacent to the first end of the thermochemical reaction chamber and associated with an inlet valve provided for feeding biomass into said thermochemical reaction chamber at a controlled speed, preventing air from freely entering said thermochemical reaction chamber; • at least one fraction outlet for the exit of gas, liquid and/or solid fractions, product of the treatment of biomass in the mentioned thermochemical reaction chamber, provided in a position adjacent to the second end of the thermochemical reaction chamber and associated with at least one outlet valve provided for extracting said fractions, preventing air from freely entering said thermochemical reaction chamber; • a screw conveyor with an outer diameter fitting the inner diameter of the thermochemical reaction chamber and a length fitting the axial length of said chamber, said screw conveyor being arranged concentric with said cylindrical thermochemical reaction chamber and attached to a drive shaft; • actuating means connected to said drive shaft for causing it to rotate about an axis at a controlled speed; • a plurality of heating means provided for controllably heating said thermochemical reaction chamber to temperatures up to 1200°C, sufficient to cause torrefaction, pyrolysis and/or gasification of a biomass introduced in said thermochemical reaction chamber; • said plurality of heating means include a plurality of external electrical heating means arranged around said cylindrical wall, located between said thermochemical reaction chamber and said thermal insulation, in successive axial positions with respect to the mentioned cylindrical wall; • each external heating means is associated with an independent ceramic plate, which is part of a plurality of ceramic plates; characterized in that • said plurality of external heating means are also arranged in different angular positions with respect to the mentioned cylindrical wall, forming an array of ceramic plates extending around and along the mentioned chamber; • the external electrical heating means include sensors providing information to a programmable logic controller, which is configured for regulating the temperature and/or actuating time of each external electrical heating mean based on the data supplied by the sensors, being each external electrical heating means electronically controlled independently with respect to the rest of the heating means. • a cylindrical thermochemical reaction chamber demarcated by a cylindrical wall and by a first closed end and a second closed end, defining an inner diameter and an axial length of the chamber; • thermal insulation arranged around said thermochemical reaction chamber, surrounding it; • a biomass inlet provided in a position adjacent to the first end of the thermochemical reaction chamber and associated with an inlet valve provided for feeding biomass into said thermochemical reaction chamber at a controlled speed, preventing air from freely entering said thermochemical reaction chamber; • at least one fraction outlet for the exit of gas, liquid and/or solid fractions, product of the treatment of biomass in the mentioned thermochemical reaction chamber, provided in a position adjacent to the second end of the thermochemical reaction chamber and associated with at least one outlet valve provided for extracting said fractions, preventing air from freely entering said thermochemical reaction chamber; • a screw conveyor with an outer diameter fitting the inner diameter of the thermochemical reaction chamber and a length fitting the axial length of said chamber, said screw conveyor being arranged concentric with said cylindrical thermochemical reaction chamber and attached to a drive shaft; • actuating means connected to said drive shaft for causing it to rotate about an axis at a controlled speed; • a plurality of heating means provided for controllably heating said thermochemical reaction chamber to temperatures up to 1200°C, sufficient to cause torrefaction, pyrolysis and/or gasification of a biomass introduced in said thermochemical reaction chamber; • said plurality of heating means include a plurality of external electrical heating means arranged around said cylindrical wall, located between said thermochemical reaction chamber and said thermal insulation, in successive axial positions with respect to the mentioned cylindrical wall; • each external heating means is associated with an independent ceramic plate, which is part of a plurality of ceramic plates; • said plurality of external heating means are also arranged in different angular positions with respect to the mentioned cylindrical wall, forming an array of ceramic plates extending around and along the mentioned chamber; • the external electrical heating means include sensors providing information to a programmable logic controller, which is configured for regulating the temperature and/or actuating time of each external electrical heating mean based on the data supplied by the sensors, being each external electrical heating means electronically controlled independently with respect to the rest of the heating means.