The utility model relates to an it detects and monitoring devices to simulate loaded power knife rest performance of typical operating mode overcomes prior art and has the data that detect and can't truly reflect the actual performance of knife rest and can not obtain different typical operating modes the problem of influence, precision decline law and the prediction knife rest trouble of power knife rest performance, support part, the measuring of servo knife rest partial performances and monitoring devices, the measuring of power take -off partial performances and monitoring devices, dynamic cutting force load part, unit head load subtotal automatic control part including power knife rest, power knife rest, the power knife rest comprises servo knife rest subtotal power output part, developments cutting force loading part is including developments power analog loading device, developments power analog loading strutting arrangement, the utility model discloses a plurality of projects of servo knife rest part in the power knife rest, the performance of servo knife rest part in comprehensive reflection power knife rest have been covered in the integrateed multiple performance index's of power knife rest detection and monitoring, test content.