CT detector suitable for long samples

The invention provides a CT detector suitable for long samples. The CT detector comprises a whole-shielded radiation protection box and a motion assembly arranged in the whole-shielded radiation protection box through a support, wherein the motion assembly comprises a motion base, a driving rotating assembly and a driven rotating assembly are arranged at two ends of the motion base respectively; a sample holder is deployed at the outer end of the driving rotating assembly and/or the driven rotating assembly; a radiation source detector assembly capable of moving horizontally in the length direction of the motion base is also arranged on the motion base. The CT detector suitable for the long samples has the advantages as follows: the CT detector is small in size and light in weight, can drive the samples to rotate by the aid of the driving rotating assembly, can detect the samples in all directions in combination with horizontal movement of the radiation source detector assembly to realize total-travel helical scanning imaging of the long samples, the detection accuracy is greatly improved, and the detection speed can be increased.