A new type monochromatic X-ray crystal spectrograph which can be used to catch the K-shell line images of the imploding aluminum wire arrays was developed. The core component of the spectrograph is the crystal analyzer which was designed to the shape of logarithmic spiral in meridian plane. By taking advantages of the logarithmic spiral, monochromatic X-ray image of Z-pinch plasma can be obtained with the imager system in large field of view. Experiments have been carried on the "Yang" accelerator. In experiment, the hydrogenlike line (1727.7 eV) and heliumlike line (1588.3 eV) images of the imploding Al wire arrays were obtained. The results showed that the spectrograph can reflect the exploding modality of Z-pinch Al plasma, and multi-hot spots due to magnetic Rayleigh-Taylor instability also appeared on the images.