Vacuum leakage detector

The utility model discloses a vacuum leakage detector comprising a three-way pipe, an air-in structure connected to one of the ports of the three-way pipe, an air-out structure connected to another port of the three-way pipe and a junction structure connected to the last port of the three-way pipe. The utility model has the advantages of that the detector is of simple structure, convenient operation, easy carry, and the vacuum pressure can be adjusted to meet the testing requirement of vaccum sealability of welding line, The accuracy and reliability of vaccum sealability testing are ensured.