Crack resistance of self curing concrete was investigated through plate cracking test in early age. The plastic shrinkage, adiabatic temperature rise and internal relative humidity change of self curing concrete were homologously analyzed. The crack resistance change of self curing concrete and its micro mechanisms were clarified. The results show that the early plastic shrinkage is reduced and the adiabatic temperature rise is lowered by waterlogged ceramsite, which effectively enhances the crack resistance of self curing concrete. The hydration environment of cementitious material in concrete is improved by waterlogged ceramsite and its self curing effect. The optimal proportion of waterlogged ceramsite replacing coarse aggregate was proposed as 20%(by volume) in both C30 and C60 concrete.