The invention discloses a preparation method for a titanium alloy rocking-rolling piece metallographic specimen. A titanium alloy TC4 rocking-rolling piece is taken as a raw material; the preparationmethod comprises the following steps of dividing, performing coarse grinding, performing fine grinding, performing electrolytic polishing, corroding by using a corrosive and the like in sequence. Thepreparation method for the titanium alloy rocking-rolling piece metallographic specimen disclosed by the invention can be applied to a product which deforms easily, is large in deformation amount, high in stress and irregular in appearance; after the specimen is corroded, the specimen is in a matte colour and bright colour; the corrosion uniformity is good; a corroding method has high selectivity;important metallographic information, such as grain morphology and grain structure type, can be obtained by observing the corroded metallographic structure through a metallographic microscope, so that the corroded metallographic structure is more beneficial to observation and is observed more accurately; the preparation method is low in cost, simple in specimen preparation process, short in specimen preparation period, and worthy of market promotion and application.