The invention relates to a precast concrete slab which comprises a slab-shaped main body consisting of steel bars and concrete covering the steel bars, the upper surface of the slab-shaped main body comprises a lapping structure layer, and the surface of the lapping structure layer is provided with combing marks, pressing marks and/or swash marks with 2-10mm. The invention is also provided with apreparation method of the precast concrete slab. The invention realizes tight combination of the precast concrete slab and a cast-in-place part through the lapping structure layer integrating with theslab-shaped main body, and can effectively prevent a combination part from shedding, sliding and the like.