A Pig Signaller is a necessary piece of equipment in the technological process of ball passing and descaling of long-distance pipeline. It can accurately show whether the pig has passed a predetermined place. This can assist in the successful completion of pigging and sweeping. At present, the ball indicators used at home and abroad basically meet the requirements of pigging and sweeping. But it is troublesome to maintain and repair it. Most pigs need pipeline pressure relief and shutdown, and the economic loss is immeasurable. And we provide a ball indicator with pressure disassembly that is easy to disassemble and maintain. To solve the problems raised in the above background technology.