Slope crack monitoring device and measuring method thereof

The invention discloses a slope crack monitoring device and a measuring method thereof. The apparatus comprises fixed piles, fixed rings and a convergence gauge, wherein the fixed piles are arranged at two sides of a crack, the fixed rings are fixedly connected with the fixed piles, a hook at one steel rule end of the convergence gauge is hooked to the fixed ring at one side, and a hook at the convergence gauge end is hooked to the fixed ring at the other side. When the convergence gauge is adopted to measure the deformation situation of the crack, a convergence gauge having an appropriate precision can be selected according to engineering needs in order to realize the measurement, and the convergence gauge can be continuously used after the engineering ending. The apparatus has the advantages of simple installation, operating convenience, repeated use, economy, practicality, simple measuring principle, high measuring precision, high anti-interfere capability, and stable and reliable performances.