An exemplary workpiece inspecting device includes a base, a slider, a handle, a number of magnets, a number of probes and a measuring block. The slider is slidably mounted on the base and supports the handle thereon. The magnets are respectively embedded into the base for attracting and fixing a workpiece on the base. The probes are separately disposed on both the base and the slider for inspecting the perforations defined on a workpiece. The measuring block is attached on the slider for sliding and inspecting a thickness of the workpiece during the movement of the slider.