To address the issue of weak out-of-band suppression in traditional artificial surface plasmon (SSPPs) microwave filters, a miniaturized SSPPs wide-stopband microstrip lowpass filter featuring a novel butterfly structure is devised and fabricated. Firstly, by integrating the fan structure in the conventional microstrip filter with the SSPPs theory, the butterfly structure of SSPPs is designed to obtain a broader stopband. To enhance the out-of-band suppression level of the filter, an anti-directional arrowhead resonant patch is introduced to suppress the parasitic passband at 25 GHz within the stopband. The optimal design of the SSPPs unit is accomplished by simulating the dispersion characteristics of the unit structure. A complete SSPPs filter structure is designed, and the impact of key parameters on the performance of the filter is simulated. The metal-medium-metal (MIM) structure of the filter is fabricated using F4B substrate, and its performance is measured. The results indicate that the 3-dB cut-off frequency of the filter is 10.08 GHz,with the highest stopband frequency reaching 33 GHz. Return loss within the passband consistently exceeds 15 dB, while maximum insertion loss within this range is measured at 2.6 dB.Notably, minimum attenuation within the stopband measured at 22.98 dB between 11~35 GHz, with return loss generally exceeding 3 dB across the range of 10~30 GHz and peaking at 4 dB from 10~34 GHz. The test results of this design meet the design index, the out-of-band suppression effect is ideal, and it can be integrated with mixers, signal generators, and other devices to exert a superior circuit performance.