To provide an automatic programming simulation device capable of easily correcting an NC program and starting simulation from a corrected part.

An automatic programming part 10 having an NC program conversion processing part 16 to generate the NC program and an interactive input/editing processing part 11 is provided. A simulation part 20 having an image data generation processing part 21 to successively generate pixel data about the shape of a tool and the shape of a work from the NC program and a plotting processing part 25 to display a tool image and a work image on a display device 31 is provided. The simulation part 20 accepts the input of a coordinate position specified on a display screen of the display device 31, recognizes process specification information of pixels corresponding to the accepted coordinate position, transmits the recognized process specification information to the interactive input/editing processing part and processes it so as to be transited to an editing processing of data corresponding to the process specification information received by the interactive input/editing processing part.