The invention relates to a pressure detection device for flyer presser, which comprises: a mechanical drive part with a testing bed with work desk, a differential gearing system reducing mechanism arranged on the desk, a ratcher-pawl single drive mechanism, a end cam manual cantilever beam reset mechanism, and a worm-and-wheel speed reducing drive mechanism; a control part of a PLC programming-control frequency converter; and a signal processing part with a strain gage stuck on the cantilever beam, a signal wire, a collector ring, a dynamic resistance strain meter, and a data collector all electric connected by turns. This invention can realize continual dynamic full distance test, and has accurate detection with simple operation.