The invention relates to an experimental device, in particular to a dynamic metal cutting process-observable experimental device. The experimental device comprises a frame, wherein the frame is formed by welding square steel tubes and is divided into an upper layer, a middle layer and a lower layer; the upper layer mainly comprises a linear guide rail, a sliding block, an operating platform, a portal frame, a tool rest, a tool, a workpiece, a microscopy camera, a computer and a display; the middle layer mainly comprises a swinging needle type planet gear speed reducer, a belt pulley and a screw rod nut; the lower layer mainly comprises a frequency converter, a motor, a swinging needle type planet gear speed reducer and a belt pulley; by the frequency converter, the frequency of the motor can be changed so as to finally change the movement speed of the operating platform; and when the tool cuts the workpiece, the microscopy camera is used for shooting pictures and displaying the shot pictures through the computer in real time and can be used for picture taking or image recording. Through the implementation of the device, a dynamic metal cutting process can be observed, the phenomenon is obvious and the consumed time is short; and the experimental device is easy to operate and has low cost.