Testing device for conducting real-time measurement on cracking time and cracking width of concrete at early stage

The utility model discloses a testing device for conducting real-time measurement on cracking time and cracking width of concrete at an early stage. The testing device comprises a concrete sample with a square outside and a circle inside, an inner steel ring arranged in an inside circle of the concrete sample and a base plate arranged at the lower end of the inner steel ring. Twelve working strain sheets are pasted at four positions of the concrete sample with minimum thickness corresponding to the inner steel ring, the twelve working strain sheets are divided into an upper layer, a middle layer and a lower layer, a temperature compensation sheet is vertically pasted at the position near each working strain sheet, the working strain sheets and the temperature compensation sheets are connected with a strain acquisition system in a half-bridge connection mode, a concrete surface crack meter is respectively arranged in the middle of the outer surface of the at four positions of the concrete sample with the minim