A clamping mechanism providing automatically accurate placement includes a pillar, a first clamping plate fixed to a first end of the pillar, and a second clamping plate movably coupled to a second end of the pillar and opposite to the first clamping plate. The first clamping plate includes a base plate. The base plate includes a first surface facing the second clamping plate and two opposite side faces connected to the first surface. The first surface is concave and defines two first positioning slots on opposite sides. Each first positioning slot passes through the two side faces. The first positioning slots are configured to position a carrying frame on a transferring apparatus accurately. A transferring apparatus including the clamping mechanism is also disclosed.