Workpiece fixing device of dry-wet compound machine

The utility model discloses a workpiece fixing device of a dry-wet compound machine, which comprises an operating table, two groups of symmetrical fixing columns are fixedly connected to two ends of the top of the operating table, a second opening is formed in the outer surface of each fixing column, a lifting block is connected into each second opening in an embedded manner, and the lifting blocks are fixedly connected to the two ends of the top of the operating table. A first fixing rod is connected to the center axis of the lifting block in a penetrating mode, a first positioning rod is connected to the center of the top of the lifting block in a penetrating mode, and a fixing block is fixedly connected to the outer surface of the first positioning rod. According to the lifting device,the second positioning rod can be inserted into the second positioning hole in the fixed column so that the lifting block can be fixed to the designated position of the fixed column, the rolling wheelcan drive the lifting blo