The present invention discloses a magnetic latching relay substrate with high stability. The substrate comprises a pedestal and an isolation frame, the surface of the pedestal is embedded with the isolation frame, the isolation frame is internally provided with a magnetic latching relay, a temperature alarm is fixedly installed at the lower portion of the magnetic latching relay, a cooling hole isinlaid at the lower portion of the temperature alarm, one side of the isolation frame is embedded with a sliding buckle groove, the internal portion of the sliding buckle groove is slidably connectedwith a sliding buckle, one side of the pedestal is embedded with a transparent plastic cover groove, and one side of the pedestal is embedded with an air outlet. The magnetic latching relay substratewith high stability is provided with a cooling device to effectively avoid a condition that the magnetic latching relay is too high when being operated, facilitate people usage and have good market prospects, and is provided with the temperature alarm to perform effective detection for the temperature of the magnetic latching relay, improve the practicability and ensure the usage safety, and themagnetic latching relay substrate with high stability is novel in design and compact in structure and is suitable for batch production and usage.