Disclosed herein are a handheld device and method for measuring the quality of an optical link, which are capable of simultaneously measuring the strength of an optical signal and the quality of an optical link at an optical network terminal in a Fiber-to-the-Home (FTTH) network. A presented handheld device for measuring a quality of an optical link includes an optical signal input port for receiving an optical signal, an optical power measurement unit for measuring a power of the optical signal, an output unit for outputting one or more of a measured power value of the optical signal and results of quality measurement of an optical link, based on interworking with an optical network terminal, and a control unit for storing the measured power value of the optical signal and performing a process for quality measurement of the optical link.