Cleaning head comprising a wet cleaning device comprising: - a mop support on which a mop is intended to be mounted, - a cleaning liquid reservoir which is located above the mop support and which is configured to supply a mop with cleaning liquid mounted on the mop support, the cleaning liquid reservoir comprising a liquid outlet provided in a lower part of the cleaning liquid reservoir, - a blocking member which is movably mounted relative to the cleaning liquid reservoir between a blocking position wherein the blocking member blocks the liquid outlet and a release position wherein the blocking member releases the liquid outlet, - an actuation member configured to be actuated by a user, the actuation member being movably mounted between a first actuation position and a second actuation position, the actuation member and the blocking member being configured such that a movement of the actuation member from the first actuation position to the second actuation position leads to a movement of the blocking member from the release position to the blocking position and such that a movement of the actuation member from the second actuation position to the first actuation position leads to a movement of the blocking member from the blocking position to the release position, characterised in that the actuation member comprises an actuation part which is configured to engage with the blocking member, and in that the blocking member comprises a first indexing surface, a second indexing surface which is more extended from the liquid outlet than the first indexing surface, and a connecting surface which is inclined and which is arranged between the first and second indexing surfaces (44, 45), the actuation part being configured to bear against the first indexing surface when the actuation member occupies the first actuation position and to bear against the second indexing surface when the actuation member occupies the second actuation position, the actuation part being configured to slide over the connecting surface and move the blocking member from the release position to the blocking position when the actuation member is moved from the first actuation position to the second actuation position. - a mop support on which a mop is intended to be mounted, - a cleaning liquid reservoir which is located above the mop support and which is configured to supply a mop with cleaning liquid mounted on the mop support, the cleaning liquid reservoir comprising a liquid outlet provided in a lower part of the cleaning liquid reservoir, - a blocking member which is movably mounted relative to the cleaning liquid reservoir between a blocking position wherein the blocking member blocks the liquid outlet and a release position wherein the blocking member releases the liquid outlet, - an actuation member configured to be actuated by a user, the actuation member being movably mounted between a first actuation position and a second actuation position, the actuation member and the blocking member being configured such that a movement of the actuation member from the first actuation position to the second actuation position leads to a movement of the blocking member from the release position to the blocking position and such that a movement of the actuation member from the second actuation position to the first actuation position leads to a movement of the blocking member from the blocking position to the release position,