The utility model discloses a crooked formula mechanism of amplification of meeting an emergency, including rigid bar, the one end of rigid bar's one end fixedly connected with spring beam, application method regards as the fixed point for fixing 2 o'clock with crooked formula mechanism of amplification of meeting an emergency on the testee, and wherein at least one fixed point sets up on rigid bar, be connected with strain measuring device with rigid bar fixed connection's spring beam. The utility model discloses the mechanism is simple, and the preparation is convenient, and is lightly easy -to -use, stick on the foil gage after, can follow the orientation of meeting an emergency of the object of measuring and fix the object surface of measuring the small strain at various needs with this mechanism, the installation is simple swift, and is fixed firm, uses ten minutes convenience in a flexible way. The fractional error that ambient noise aroused when this mechanism measured compares unchangeably with directly using the foil gage measurement, but the ratio of system error relative measurement value reduces, has reduced measuring fractional error, further improves the precision.