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The application discloses a kind of based on tractor three-point suspension's chopping quick dismounting device, belong to modern agricultural machinery technical field, it includes silage machine frame, chopping device, suspension device and tractor frame;The chopping device is assembled on silage machine frame, suspension device is installed on tractor frame, initial state is that silage machine frame is connected with chopping device, suspension device is connected with chopping device to be used for adjusting the angle of chopping device, silage machine frame moves on ground to adjust position, so that chopping device and silage machine frame are with preset angle and position between realization split or assembly.The application greatly shortens the dismounting process of chopping device on silage machine frame, improves the dismounting efficiency of chopping device, saves manpower and material resources, also greatly avoids the safety risk of chopping device in dismounting process.