Plate cutting saw

The utility model provides a cut-to-size saw. Wherein the machine table is arranged at the top of the machine body, the guide rail is arranged on one side of the machine table, the sliding table can move on the guide rail in a reciprocating mode, the bracket moves along with the sliding table, the supporting arm is used for supporting the bracket, the sliding rod is arranged on the front edge of the machine table, the sliding block is arranged on the sliding rod in a sliding and sleeving mode, and the positioning piece is fixed to the sliding block. A baffle capable of moving up and down is arranged in a gap between the saw blade and the sliding table; the height of the lower edge of the baffle is gradually reduced from front to back; the front end of the lower edge of the baffle is higherthan the upper surface of the sliding table, and the higher height is not smaller than the thickness of a to-be-machined plate. The rear end of the baffle lower edge is not higher than the upper surface of the sliding table.