Automatic replacing device for machining milling head of numerical control lathe

The invention discloses a numerical control lathe machining milling head automatic replacing device which comprises a numerical control lathe, a tool magazine mechanism and a tool changing mechanism, the tool magazine mechanism comprises a plurality of sets of different types of milling heads and a tool rest used for placing the milling heads, and the tool changing mechanism is arranged on one side of the tool magazine mechanism. A three-axis movement module of the tool changing mechanism comprises a tail end movement table capable of moving in the three-axis direction, a rotating component is fixedly connected to the tail end movement table, a clamping component is fixedly connected to the rotating component, the clamping component can be driven by the three-axis movement module to move in the three-axis direction, and the clamping component can clamp a milling head on a tool rest. And the three-axis movement module is matched with the rotating component to drive the clamped milling head to correspond to the