The invention discloses an electric vehicle battery safety monitoring system, which comprises a first detection unit, a second detection unit, and a third detection unit. The first detection unit is used to carry out electrical performance tests: short-circuit test, overcharge test, and over-discharge test. The second detection unit is used to carry out mechanical performance tests: impact test, falling test, puncture test, rolling test, immersion test, and crushing test. The third detection unit is used to carry out thermal tests: high temperature test, thermal stability test, heat-free management circulating test, thermal impact circulating test, and passive propagation resistance test. The provided system solves the problems that in the prior art, the safety detection of electric vehicle battery is mainly carried out by humans, and the detection efficiency and accuracy are low. The design of the monitoring system is reasonable, the detection efficiency is high, and the detection result is accurate.