Grating collimator

The utility model discloses a grating collimator for radiotherapy, comprising an upper fixing plate, a lower fixing plate, a back fixing plate, a magazine device, a needle pushing device, a needle withdrawal device, a guide way, a grating conveying device and a drive device. Wherein, the needle withdrawal device is fixed above the upper fixing plate, the magazine device is fixed on the lower fixing plate, the needle pushing device is fixed below the lower fixing plate, the needle pushing device is positioned under the magazine device, the needle withdrawal device is positioned over the magazine device, an operation space is restricted between the upper fixing plate and lower fixing plate, the guide way is arranged between the upper fixing plate and lower fixing plate, part of the guide way extends to the exterior of the upper and lower fixing plate, the grating conveying device is arranged on the guide way and connected with the drive device, which drive the grating conveying device along the guide way to move between the operation space and exterior of the operation space. The utility model is good in common use, high in automation, convenient in use and high in efficiency, which meets the needs of high accuracy in the radiotherapy field and high speed of image following.