A production method of graphene foil with a pre-defined number of graphene layers covering the following stages: a) producing graphene on a metallic substrate; b) depositing a polymer layer on the graphene surface; c) separating the polymer/graphene stack from the metallic substrate d) transferring the obtained polymer/graphene stack directly onto the metallic substrate with at least one graphene layer deposited on top; e) separating the polymer/graphene/graphene stack from the metallic substrate characterized in that it comprises the stage of transferring polymer/graphene with the target number of layers onto a substrate, being a porous sponge; wherein the following stages are included between stages d) and e): f) dividing the obtained polymer/graphene/graphene/metal stack at least into two parts, preferably with an identical surface area, g) removing polymer from one of the abovementioned parts of the polymer/graphene/graphene/metal stack, h) separating the polymer/graphene/graphene stack from the latter part of the metallic substrate, i) transferring the polymer/graphene/graphene stack obtained in step h) onto the graphene/graphene/metal stack produced in step g); wherein stages d) - i) are repeated until the target number of graphene wafers is obtained. a) producing graphene on a metallic substrate; b) depositing a polymer layer on the graphene surface; c) separating the polymer/graphene stack from the metallic substrate d) transferring the obtained polymer/graphene stack directly onto the metallic substrate with at least one graphene layer deposited on top; e) separating the polymer/graphene/graphene stack from the metallic substrate characterized in that it comprises the stage of transferring polymer/graphene with the target number of layers onto a substrate, being a porous sponge; wherein the following stages are included between stages d) and e): f) dividing the obtained polymer/graphene/graphene/metal stack at least into two parts, preferably with an identical surface area, g) removing polymer from one of the abovementioned parts of the polymer/graphene/graphene/metal stack, h) separating the polymer/graphene/graphene stack from the latter part of the metallic substrate, i) transferring the polymer/graphene/graphene stack obtained in step h) onto the graphene/graphene/metal stack produced in step g); wherein stages d) - i) are repeated until the target number of graphene wafers is obtained. characterized in that it comprises the stage of transferring polymer/graphene with the target number of layers onto a substrate, being a porous sponge; wherein the following stages are included between stages d) and e): f) dividing the obtained polymer/graphene/graphene/metal stack at least into two parts, preferably with an identical surface area, g) removing polymer from one of the abovementioned parts of the polymer/graphene/graphene/metal stack, h) separating the polymer/graphene/graphene stack from the latter part of the metallic substrate, i) transferring the polymer/graphene/graphene stack obtained in step h) onto the graphene/graphene/metal stack produced in step g); wherein stages d) - i) are repeated until the target number of graphene wafers is obtained. f) dividing the obtained polymer/graphene/graphene/metal stack at least into two parts, preferably with an identical surface area, g) removing polymer from one of the abovementioned parts of the polymer/graphene/graphene/metal stack, h) separating the polymer/graphene/graphene stack from the latter part of the metallic substrate, i) transferring the polymer/graphene/graphene stack obtained in step h) onto the graphene/graphene/metal stack produced in step g); wherein stages d) - i) are repeated until the target number of graphene wafers is obtained. <EOS>