The invention relates to a sheet cutting machine. The machine comprises a rack, a coiling mechanism, a charging platform, a longitudinal cutting tool mechanism, a main driving mechanism and a transverse cutting tool mechanism, wherein the charging platform, the longitudinal cutting tool mechanism, the main driving mechanism and the transverse cutting tool mechanism are fixed to the rack and sequentially distributed from front to back; the coiling mechanism is fixed to the front part of the rack and is parallel to the charging platform in top and bottom direction; the longitudinal cutting toolmechanism comprises a tool holding rack, a first pneumatic type shearing tool and a lower cutting tool roller; two ends of the tool holding rack are horizontally fixed to the rack; the first pneumaticshearing tool is fixed to the tool holding rack; the lower cutting tool roller is fixed below the tool holding rack; a rolling tool corresponding to the first pneumatic shearing tool is arranged on the lower cutting tool roller; the first pneumatic shearing tool is arranged corresponding to the rolling tool; when in cutting, the first pneumatic shearing tool and the rolling tool are matched to perform longitudinal cutting; the lower cutting tool roller is synchronously driven through the main driving mechanism; a sheet enters the longitudinal cutting tool mechanism through the charging platform and then is lengthways cut.