The invention discloses a piano tone tuning device and an implementation method thereof and relates to the technical field of piano tone tuning, in particular to a device and a method for detecting the string frequency during tone tuning of a piano. The technical problems of high specialty requirement, low tuning accuracy and inconvenience in operation in the conventional piano tone tuning work are solved so as to implement the tone tuning detection method. The method comprises the following steps of: a, adhering a laser identification paste on a string to be detected; b, allowing the light ray of a laser head to irradiate on the laser identification paste; c, pressing a key corresponding to the string to be detected; d, providing a detection signal source for a central processing unit, and detecting the actual frequency value of the string; and e, comparing. According to a principle that the laser head reads a disk in a CD-driver, the tone tuning operation of the piano is realized, special requirements on hearing of tuning staff are avoided, common operation staff can finish the operation, and the method is convenient to operate and is high in tuning accuracy.