Differential pressure signaling device

The utility model discloses a differential pressure pinger which comprises a shell, a mandrel and an indicating ring, wherein a guide column and a liquid collecting cavity are respectively arranged at two ends of the shell; the mandrel is arranged in the liquid collecting cavity in a sliding manner; the indicating ring is sleeved on the guide column in a sliding manner; the liquid collection cavity is divided into a high-pressure cavity and a low-pressure cavity which are independent from each other by the separation block; an induction magnetic block is embedded in the indication ring, the mandrel is provided with a driving magnetic block, and the polarity of the induction magnetic block is the same as that of the driving magnetic block. When the pressure difference between the high-pressure cavity and the low-pressure cavity is increased, the driving magnetic block synchronously moves in the direction away from the high-pressure cavity along with the mandrel, and the driving magnetic block pushes the indica