The invention relates to a device for controlling the voltage of a cell of a fuel cell, characterized in that said control device comprises a first transistor (Q1) associated with the cell, which is connected to the cell via the base thereof and to a current generator, and a control voltage source (VRi) inserted between the cell and the first associated transistor (Q1), the control voltage source supplying a control voltage equal to the voltage differential between the first and second threshold voltages, such that: when the cell has a voltage (V1) higher than a first threshold voltage, the first transistor (Q1) has a voltage (Vbe1), at the terminals of the base-emitter junction thereof, which is higher than the second threshold voltage, and which conducts the current, and, when the cell has a voltage (V1) which is lower than the first threshold voltage, the first transistor (Q1) has a voltage (Vbe1), at the terminals of the base-emitter junction thereof, which is lower than the second threshold voltage and which blocks the transmission of the current.