To provide a plate material machining system configured to reduce the overall machining time of the system.

The plate material machining system 1 includes: an input unit 12 positioned upstream of a conveying line L and inputting a plate raw material W₁ to be machined in the conveying line L; a positioning and conveying unit 22 positioned upstream of the conveying line L and conveying and positioning the plate raw material W₁ input in the conveying line L; a machining unit 32 for performing predetermined machining on the positioned plate raw material W₁ to form a machined plate material W₂; and a discharge unit 42 positioned downstream of the conveying line L and conveying and discharging the machined plate material W₂. A printing means 52 for printing predetermined necessary information in a predetermined position of the plate raw material W₁ to be machined next is arranged in a proper position upstream of the machining unit 32 for performing machining pretreatment on the plate raw material W₁, so as to reduce the overall machining time of the system and increase speed.