Device for detecting leakage of joint

The utility model discloses a device for detecting joint leakage, which comprises a box body, the top of the right side of the box body is fixedly connected with an air cylinder, the left side of the air cylinder is fixedly connected with a fixed pipe, one side of the fixed pipe is communicated with a trapezoidal column, and the left side of the outer surface of the trapezoidal column is provided with a first connecting pipe. The left side of the first connecting pipe is connected with a second connecting pipe through a flange plate, a connecting column is arranged on the left side of the second connecting pipe, the other side of the fixing pipe communicates with an air bag, and the right side of the air bag communicates with a pressure gauge. Through cooperation of the box body, the air cylinder, the fixing pipe, the trapezoidal column, the first connecting pipe, the flange plate, a second connecting pipe, a connecting column, a fixing column, an air bag, a pressure gauge, a corrugated pipe, an exhaust pipe,