The embodiment of the invention discloses an X-ray bulb tube focus shift detection method, device and equipment, and realizes detection of shifting of the effective focus of the X-ray bulb tube. The method comprises the steps that first scanning using the X-rays produced by the ideal effective focus of the X-ray bulb tube is performed, and a first parameter is obtained according to the first energy value outputted by the preset channel of an X-ray detector based on the preset rules; second scanning using the X-rays produced by the actual effective focus of the X-ray bulb tube is performed, anda second parameter is obtained according to the second energy value outputted by the preset channel of the X-ray detector based on the preset rules; and if the first parameter and the second parameter are not matched, the situation of shifting of the actual effective focus relative to the ideal effective focus can be confirmed.