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The application relates to an isolation main shaft assembling tool, and relates to the field of pole-mounted circuit breakers, which comprises a base, a fixing device, a placing rack and a pushing device; the pushing device and the placing rack are arranged on the base; the fixing device comprises a clamping assembly and a supporting assembly; the supporting assembly is arranged on the base and is used for supporting an isolation crank arm; the clamping assembly comprises a first clamping seat, a second clamping seat and a locking piece; the first clamping seat is connected with the base, and the isolation crank arm is placed on the first clamping seat; the locking piece locks the first clamping seat and the second clamping seat, so that the first clamping seat and the second clamping seat clamp one end of the isolation crank arm connected with the isolation main shaft; the placing rack is used for placing the isolation main shaft; the pushing device pushes the isolation main shaft to separate from the placing rack and pass through the isolation crank arm. The application has the effect of improving the assembling efficiency of the isolation main shaft.