A switchable compound laser working machine comprises a machine body, a first output module, a second output module, a switch module, and a control module. The first and second output modules are respectively provided with a laser tube. The switch module has at least one lens. It is able to change the output direction of laser beams by moving the lens. The control module is used for controlling the laser tubes of the first and second output modules to perform output operation respectively and used for moving the lens of the switch module into output pathway of the laser beams from the first or the second output module to alter the output direction of the laser beams.