The invention discloses a guide plate detection separation, turnover and pre-material-cutting device. According to the technical scheme, the guide plate detection separation, turnover and pre-material-cutting device is characterized in that a punching machine and a belt-shaped coiled material are included, and the belt-shaped coiled material comprises a belt-shaped waste material and a finished product plate material; the device further comprises a controller, a feeding mechanism used for conveying the belt-shaped coiled material, a separation mechanism used for separating the finished product plate material and the belt-shaped waste material, a turnover mechanism used for overturning the finished product plate material, and a cutting and collecting mechanism used for cutting and collecting the belt-shaped waste material; the feeding mechanism comprises a first belt material mechanism, the cutting and collecting mechanism comprises a second belt material mechanism, and the first belt material mechanism and the second belt material mechanism operate synchronously; the separation mechanism comprises a first sensor, a falling assembly and a material lifting assembly; the turnover mechanism comprises a material movement assembly, a first mechanical arm and a second mechanical arm; and the cutting and collecting mechanism comprises a cutting machine and a collecting box. By means of the device, the automation degree of punching machine machining is easily improved.