The invention discloses an all-performance testing system for a low-temperature break valve, wherein the system belongs to the technical field of valve performance testing. The all-performance testingsystem comprises an automatic control system and a break mechanism. The automatic control system is electrically connected with the break mechanism. The break mechanism comprises a supporting platform. The supporting platform is provided with a first fixed column and a second fixed column. A breaking machine is arranged on the second fixed column. The first fixed column is connected with a liquidnitrogen supplying mechanism. One end, which applies a pulling force, of the pulling machine is provided with a pulling force sensor. The all-performance testing system fills a blank in low-temperature break valve testing in China and furthermore an automatic control system is utilized for controlling the testing process. The all-performance testing system has advantages of accurately testing related data of the low-temperature break valve, more comprehensively mastering sealing performance and break performance of the tested low-temperature break valve, and realizing higher safety and higherreliability in testing.