The invention is related to agriculture, in particular, to irrigated crop farming. The irrigation signaling device comprises a hollow measuring probe 1 embedded in soil, the probe 1 having a distance scale 2 on its outside surface, and the upper, above-ground part of the measuring probe being perforated and provided with a hollow cover that consists of two coaxial vessels with coaxial central holes. The lower vessel 3 is inserted in the hollow measuring probe over its outer side surface and is provided with a flap 4 on the periphery of its back side. The upper vessel 11 includes a connection pipe above the coaxial hole and is inserted in the lower vessel 3 over its outer side surface passing through the coaxial hole of the lower vessel 3 is a rod 8 provided, in its bottom end part, with a perforated base 9 mounted on a moisture-sensitive element 10 that contacts soil through a protective filter and responses to a change in moisture content of soil by a change in its volume. The upper end part of the rod 8 accommodated in the cavity of the cover is provided with a rest 5 that carries a container 6 adjacent to the top inner surface of the upper vessel 11, the container 6 being filled with electrically conductive liquid 7 and capable or resilient-elastic deformations. The electrically conductive liquid 7 contains a surfactant colourant, and the container 6 is provided with an inner sleeve aligned coaxially with the connection pipe of the upper vessel 11 a signal element 12 is passed through the connection pipe and the sleeve of the container 6 and is sealingly connected with the sleeve. Adjoining the signal element 12 is a stored soil moisture meter 13, extreme points of stored moisture corresponding to irrigation starting and stopping. The signal element 12 and the stored moisture meter 13 are equipped with their vertical position fixing device 14, the signal element 12 being further provided with a visible or audible signaling device (references 15 and 16) warning th
