A compound saw, comprising a base, a housing having an internal chamber, a cutter head disposed inside the chamber, a transmission component and a table; wherein the housing has a front end and a rear end, the rear end of the housing is rotatably connected to the base, the front end of the housing is vertically movable relative to the base, so as to provide a cutting region below or above the housing; the housing has a first cutting slit at a bottom of the housing for the cutter head to pass through; the transmission component is installed on a lateral surface of the housing, and connected to the cutter head; the table is disposed above the housing as a work platform, the table is connected to the cutter head through the transmission component, and the table has a second cutting slit at a top of the table for the cutter head to pass through; the table has a front end and a rear end, the rear end of the table is rotatably connected to the housing, and the compound saw operates in a miter mode where the front end of the table moves upward relative to the housing, so as to expose the cutter head out of the first cutting slit; the compound saw operates in a platform mode where the front end of the table moves downward relative to the housing, so as to expose the cutter head out of the second cutting slit; characterized in that the transmission component comprises a connecting rod having a first end and a second end, and a slide seat having a front end, a rear end, a middle portion and a rear portion which both are rotatably connected to the housing, the slide seat rotates in parallel to the housing; the first end of the connecting rod is hinged to the table, the second end of the connecting rod is hinged to the rear end of the slide seat, and the front end of the slide seat is a free end. wherein the housing has a front end and a rear end, the rear end of the housing is rotatably connected to the base, the front end of the housing is vertically movable relative to the base, so as to provide a cutting region below or above the housing; the housing has a first cutting slit at a bottom of the housing for the cutter head to pass through; the transmission component is installed on a lateral surface of the housing, and connected to the cutter head; the table is disposed above the housing as a work platform, the table is connected to the cutter head through the transmission component, and the table has a second cutting slit at a top of the table for the cutter head to pass through; the table has a front end and a rear end, the rear end of the table is rotatably connected to the housing, and the compound saw operates in a miter mode where the front end of the table moves upward relative to the housing, so as to expose the cutter head out of the first cutting slit; the compound saw operates in a platform mode where the front end of the table moves downward relative to the housing, so as to expose the cutter head out of the second cutting slit; characterized in that the transmission component comprises a connecting rod having a first end and a second end, and a slide seat having a front end, a rear end, a middle portion and a rear portion which both are rotatably connected to the housing, the slide seat rotates in parallel to the housing; the first end of the connecting rod is hinged to the table, the second end of the connecting rod is hinged to the rear end of the slide seat, and the front end of the slide seat is a free end.