Adjustable X-ray collimator

The utility model discloses an adjustable X-ray collimator which comprises a connector, the connector is installed on an X-ray emitter at the top end, a moving ring is connected in the connector in a sliding mode, a collimating lens is installed in the moving ring, a rotating shell is movably connected to the connector, and the rotating shell is connected with the moving ring through a ball. The connector is in threaded connection with the top end of the X-ray emitter, an annular groove is formed in the connector, a clamping part is arranged at the bottom of the annular groove, and the clamping part is a semicircular ring arranged on the inner walls of the two sides of the annular groove; the width of parallel X-rays can be changed by changing the distance between the collimating lens and the X-rays, the farther the distance between the collimating lens and the X-rays is, the larger the width of the parallel X-rays is, and the movable ring can be moved by rotating the rotary shell, so that the position of the