A pouring device for filling up a liquid in a reservoir from a spare liquid container or from a liquid supply system, in particular for filling up a liquid in the windscreen washer liquid reservoir from a liquid container or distributor, wherein the device comprises a filler unit and a liquid pouring unit which are adapted to be connected with each other and to create a sealed connection between the inner space of the reservoir to be filled and the interior space of the spare liquid container or liquid supply system and the device is further equipped with a lock-release mechanism for locking and releasing of the said connection, wherein the pouring unit comprises an outflow pipe, which is connected at one end to the feeding line or conduit connected to the spare liquid container or installation and at the other end, the outflow pipe is closed by means of a closure surface, wherein, at the side facing the closure surface, namely on its end segment close to the closure surface, the outflow pipe has at least one side outflow opening (5, 6) disposed on a side surface thereof and the outflow pipe is further equipped with a closure pipe slidably arranged with a clearance around its outer surface, which closure pipe is in turn slidably mounted in a holder of the pouring unit, moreover, over the outer surface of the outflow pipe, a biasing member is provided, preferably a spring of the pouring unit, biasing the closure pipe to the position in which it closes tightly at least one side outflow opening (5, 6) of the outflow pipe positioned in its rest position, while the filler unit comprises the inflow pipe, which is at one end terminated with the seat, for sealed receiving of the closure pipe, and at the other side the inflow pipe is connected by means of a flow communication to the reservoir, characterized in that the lock-release mechanism is provided downstream of the filler unit, looking in the direction of the liquid flow into the reservoir to be filled, for blocking the liquid communication between the outflow pipe and the inner space of the reservoir to be filled in a filling position of the device and for releasing the lock and at the same time for automatically closing the liquid communication after filling the reservoir up to the given level or pressure value, wherein the lock-release mechanism comprises a liquid level sensor or filling pressure sensor, arranged in and/or on the reservoir to be filled and an actuator member cooperating with a ratchet member (18, 28, 35) equipped with a latch projection (19, 28a) which is adapted in shape to a lock recess, located in vicinity of the closure surface on the closed end of the outflow pipe, which latch projection (19, 28a) is adapted to engage into this lock recess of the outflow pipe during movement of the outflow pipe to the pouring position, which is its working position, and to exit from said lock recess as a result of the action of an actuator member or by turning the outflow pipe around its longitudinal axis to allow the outflow pipe to return to its rest position, wherein the latch protrusion of the ratchet member (18, 28) is located to extend into the path of sliding movement of the outflow pipe, and in particular into the path of movement of the lock recess of the outflow pipe during its movement to the pouring position.