Auxiliary measuring structure for deep foundation pit construction and construction method

The invention discloses an auxiliary measuring structure based on deep foundation pit construction and a construction method.The auxiliary measuring structure can be installed and adjusted by installing an installation block and an adjusting block, firstly, when the device is installed, an installation groove of the installation block is inserted into a fence of a foundation pit, so that the fence of the foundation pit is inserted into the installation groove, and then the device is installed; a first auxiliary rod is rotated, the first auxiliary rod drives a first screw rod to rotate, the first screw rod rotates to drive a cam to rotate, the cam rotates to extrude a clamping rod, the clamping rod moves to drive a clamping plate to clamp a fence of a foundation pit, then the installation angle is adjusted, an adjusting column is rotated, the adjusting column drives clamping teeth to rotate, the clamping teeth impact a movable rod, and the movable rod moves. And after the angle is adjusted, a second screw rod