The invention discloses an in-situ overturning and automatic die changing mechanism for box foaming. The in-situ overturning and automatic die changing mechanism for box foaming comprises a frame body, and further comprises a servo motor, a driving sprocket, a driven sprocket, a chain, automatic die locking devices, a front baffle plate adjusting device and a front baffle plate swinging device; the frame body comprises a rectangular frame with four horizontally connected and fixed tube bodies, and the driven sprocket at the midpoint position of one long side of the rectangular frame; the driven sprocket is connected with the driving sprocket by a chain; the driving sprocket is connected with the main shaft of the servo motor; and the automatic die locking devices, the rear baffle plate adjusting device and the front baffle plate swinging device are longitudinally symmetrically arranged on an operating table in the frame body. The in-situ overturning and automatic die changing mechanismhas the advantages of reduction of the workload, no influences of die changing on the work pace, improvement of the production efficiency, and meeting of process requirements.