To investigate the effect of modification by SDS on the roasting-assisted clinoptilolite of physic-chemical properties and ammonia nitrogen removal performance from secondary effluent, natural clinoptilolite was modified by SDS-firing. The results have shown that SDS decoration can greatly improve the denitrification performance of roasted zeolite. SDS modified roasted zeolite has a better removal rate of nearly 98.79%, an increase of about 30% over the roasted samples. By scanning electron microscopy (SEM) and energy spectrum analysis (EDS), X-ray diffraction (XRD), specific surface area and pore size analysis, infrared spectra analysis (IR), and cation exchange capacity (CEC), the characterizations of the zeolite before and after being modified were analyzed. SDS modification made the surface of the zeolite particles loosen, there were more channels, and pore volume and pore diameter were increased. The silica alumina ratio of zeolite decreased, the Na ion content of the composite zeolite increased, the diffraction peak intensity weakened, and the internal chemical groups changed, further enhancing the cation exchange capacity.