The invention discloses a method for X-ray fluorimetric determination of fluorine elements in continuous casting slag, and mainly solves the problem that a conventional determination method is inaccurate. The provided method for X-ray fluorimetric determination of the fluorine elements in the continuous casting slag particularly comprises the following steps: preparing a sample, preparing a standard sample tablet, making a working curve, preparing a to-be-detected sample tablet, determining the strength by adopting an X-ray luminoscope, and substituting the strength into the made working curve to obtain the content of the fluorine elements. The fluorine elements are directly detected by using an X-ray fluorescence tabletting method, influence of other components in the sample does not need to be considered, the result is stable and accurate, and no damage is caused to the instrument.