Inordertoimprovethemeasurementaccuracyofaccuratemeasurementofspindleangleofdisconnector, taking gw4-126disconnector astheresearchobject, anaccuratemeasurement systemofspindleangleisdesigned.Inthehardware partofthesystem, thecoreprocessor, signalacquisitioncircuit, speeddetectionmoduleandstorageunit aredesigned. In the system software part, the principle of accurate measurement of GW4-126 disconnector spindle angle is proposed, the noise removal processing of GW4-126 disconnector motion track is completed, and the design of GW4-126 disconnector spindleangle accurate measurement system is completed. Theexperimental comparisonresults show thatthe measurement accuracy of GW4-126 disconnector spindle angle accurate measurement system designed this time is stable at more than 90% and the measurement time is less than 5 ms, which proves that the system effectively improves the measurement accuracy, reducesthemeasurementtimeandmeetstheapplicationrequirementsofthesystem.