Method for controlling the sealing of a cap on a container which comprises the following operating steps: - a first step of at least partly tilting a container carrying mounted a cap arranged to close the opening thereof and containing a liquid for human consumption therein with conductivity exceeding 0.5 μS/cm; said container being arranged in at least a partly capsized position in which it wets with said liquid for human consumption contained therein said cap and at least one widened portion of said container; - a first step of associating - to said container - a first electrode having a first capacitive coupling with the container at said cap, and in particular at the sealing thereof; - a second step of associating - to said container - a second electrode having a second capacitive coupling with the container, at the widened portion thereof spaced from said cap; said second capacitive coupling being made up of a first armour constituted by said second electrode and by a second armour constituted by said liquid contained in said container, with the dielectric material of the latter interposed between said second electrode and the second armour constituted by said liquid; - a step of generating at least one voltage pulse between said electrodes (6, 7); - a step for measuring the currents between said electrodes (6, 7) due to said at least one voltage pulse; - a second step of tilting said container from said at least partly capsized position to a straight position; said method being characterized in that said measurement step provides for that a measurement device detects an electrical quantity relative to the residual charge quantity in the liquid, such liquid forming the second armour of said second capacitive coupling; and said method further comprising: - a step for calculating, by means of a logic control unit, the integrals of the currents generated by said at least one voltage pulse, such integrals being equivalent to the residual charge in said second capacitive coupling, and thus indicating the residual charge in the liquid; - a discrimination step, which selects, by means of said logic control unit, values of current integrals exceeding a preset threshold value of current integral produced by said currents between the abovementioned electrodes (6, 7) passing through micro-holes present between the cap and the opening of the container, to discriminate faulty containers from containers with aseptic sealing. - a first step of at least partly tilting a container carrying mounted a cap arranged to close the opening thereof and containing a liquid for human consumption therein with conductivity exceeding 0.5 μS/cm; said container being arranged in at least a partly capsized position in which it wets with said liquid for human consumption contained therein said cap and at least one widened portion of said container; - a first step of associating - to said container - a first electrode having a first capacitive coupling with the container at said cap, and in particular at the sealing thereof; - a second step of associating - to said container - a second electrode having a second capacitive coupling with the container, at the widened portion thereof spaced from said cap; said second capacitive coupling being made up of a first armour constituted by said second electrode and by a second armour constituted by said liquid contained in said container, with the dielectric material of the latter interposed between said second electrode and the second armour constituted by said liquid; - a step of generating at least one voltage pulse between said electrodes (6, 7); - a step for measuring the currents between said electrodes (6, 7) due to said at least one voltage pulse; - a second step of tilting said container from said at least partly capsized position to a straight position; - a step for calculating, by means of a logic control unit, the integrals of the currents generated by said at least one voltage pulse, such integrals being equivalent to the residual charge in said second capacitive coupling, and thus indicating the residual charge in the liquid; - a discrimination step, which selects, by means of said logic control unit, values of current integrals exceeding a preset threshold value of current integral produced by said currents between the abovementioned electrodes (6, 7) passing through micro-holes present between the cap and the opening of the container, to discriminate faulty containers from containers with aseptic sealing.