The invention relates to a method for preparing a potassium sodium niobate functional ceramic film on a glass base surface by using a laser, belonging to the field of electronic functional ceramic preparation. The method comprises the following steps: selecting raw materials, weighing according to the stoichiometric proportion of Na0.5K0.5NbO3, mixing, carrying out ball milling, presintering at 800 DEG C for two hours by the traditional molten salt method to prepare the required functional ceramic powder; and evenly mixing and flatly laying ceramic powder and PVA (polyvinyl alcohol) on a glass base surface, drawing the functional ceramic film with required shape and dimension by using control software of the selected laser device, and selecting a pulse laser to directly sinter the powder on the glass base by using proper technological parameters, thereby obtaining the required ceramic film. The invention firstly provides and then directly prepares the potassium sodium niobate piezoelectric ceramic film on the glass base; and the invention is simple and quick to operate and has strong controllability.