Quadratic element detection device

The utility model relates to the technical field of measuring devices, and discloses a quadratic element detection device, which comprises a quadratic element measuring instrument body. The anti-skid cushion block drives the telescopic rod to vibrate through external vibration, the telescopic rod vibrates to enable the sliding block to vibrate, the sliding block vibrates to enable the sliding block to move in the sliding cavity, air pressure in the sliding cavity is changed, air needs to be exhausted or enters the sliding cavity, due to the fact that air holes are small, air cannot enter or be exhausted out of the sliding cavity immediately, movement of the sliding block is slowed down, and the service life of the sliding block is prolonged. The motor rotates to drive the screw rod to rotate, the screw rod rotates to enable the transmission rod to move, the transmission rod moves to enable the fixing plate to move along the sliding groove, the fixing plate moves to drive the measuring lens to move, and the me