Device and method for measuring shear deformation of reinforced concrete beam

The invention is applicable to the technical field of building construction, and provides a shear deformation measuring device for a reinforced concrete beam, which comprises four positioning steel bars pre-buried in a reinforced concrete test piece, and the positioning steel bars are distributed in a rectangular shape; the structure further comprises two first auxiliary reinforcing steel bars and two second auxiliary reinforcing steel bars, each first auxiliary reinforcing steel bar comprises an L-shaped reinforcing steel bar and a straight reinforcing steel bar arranged at the corner of the L-shaped reinforcing steel bar, and the second auxiliary reinforcing steel bars are L-shaped reinforcing steel bars. The two ends of the L-shaped reinforcing steel bar of the first auxiliary reinforcing steel bar are each provided with one displacement meter, the end, away from the positioning reinforcing steel bar connected with the second auxiliary reinforcing steel bar, of the second auxiliary reinforcing steel bar is