The invention discloses a cast-in-place method for small concrete members. The cast-in-place method comprises the following steps that S1, the following members comprising a bottom plate, side plates, end plates and glass connecting pieces are obtained firstly, wherein the bottom plate, side plates, the end plates and the glass connecting pieces are made of anti-explosion tempered laminated glass, the glass connecting pieces comprises connecting plates bending to be in an L-shaped, and sucking discs are arranged on the two mutually-vertical side faces deviating from the bending direction of the connecting plates; S2, formworks are assembled; and S3, casting is conducted, specifically, the inner sides of the assembled formworks are coated with demoulding agents, bound steel bars are put into formworks, concrete is cast, compacted by vibration through a vibrator and maintained till the strength of the concrete reaches 20%-40% of the strength when the concrete is fully hardened, the side plates and the end plates are dismantled, and the concrete members are maintained continuously till the concrete is fully hardened. The cast-in-place method has the advantages of being capable of improving the turnover rate of the formworks, high in production efficiency, favorable for reducing the labor intensity of workers, cost saving and the like.