三(san)重檐(yan)(yan)八角(jiao)攢(zan)尖頂,高25米,屋面(mian)鋪筒瓦兼小青瓦。殿(dian)(dian)平面(mian)呈八方形,面(mian)闊、進(jin)深均(jun)為(wei)8米。殿(dian)(dian)內結構與一般廟宇(yu)不同(tong),用四井(jing)(jing)口柱直貫二(er)層(ceng)(ceng),井(jing)(jing)口柱間施抬梁、穿枋(fang)(fang)、角(jiao)梁連(lian)接(jie),形成梁架(jia)骨(gu)干(gan)。第一層(ceng)(ceng)抬梁承(cheng)接(jie)殿(dian)(dian)內楞木樓(lou)板(ban),東西兩梁下附(fu)(fu)梁枋(fang)(fang),8根(gen)采步(bu)梁上(shang)立(li)中(zhong)(zhong)層(ceng)(ceng)檐(yan)(yan)柱8根(gen),上(shang)承(cheng)掾(yuan)枋(fang)(fang),下附(fu)(fu)檐(yan)(yan)掾(yuan);檐(yan)(yan)枋(fang)(fang)上(shang)為(wei)中(zhong)(zhong)檐(yan)(yan)斗(dou)拱(gong)。第二(er)層(ceng)(ceng)抬梁承(cheng)接(jie)頂層(ceng)(ceng)檐(yan)(yan)柱8根(gen),檐(yan)(yan)柱平板(ban)枋(fang)(fang)上(shang)置拱(gong),坐斗(dou)外(wai)側為(wei)外(wai)檐(yan)(yan)斗(dou)拱(gong),內側構成網目狀的藻井(jing)(jing),殿(dian)(dian)的斗(dou)拱(gong)大致相同(tong),層(ceng)(ceng)層(ceng)(ceng)而上(shang),內承(cheng)梁架(jia),外(wai)挑檐(yan)(yan)枋(fang)(fang)。頂部藻井(jing)(jing),八面(mian)均(jun)用斗(dou)拱(gong)。其左側用如意斗(dou)拱(gong),右側斜(xie)翅和斗(dou)拱(gong)后(hou)尾向上(shang)重疊呈網目狀,并(bing)向右旋轉,形如旋螺(luo),故殿(dian)(dian)有(you)此名。殿(dian)(dian)內檻(jian)墻有(you)清代(dai)碑刻5通,內容多為(wei)記述歷代(dai)培修旋螺(luo)殿(dian)(dian)的情(qing)況(kuang)。
在(zai)殿內(nei)第一(yi)層二(er)井口柱間抬梁上有“明(ming)萬歷二(er)十四年(nian)丙申八月殿成”題記。四十年(nian)代(dai),古建筑(zhu)學家梁思成、莫宗江(jiang)曾對殿進行考察,在(zai)《中國(guo)營(ying)造學社》七卷一(yi)期上,撰文稱該建筑(zhu)“梁柱結構之(zhi)優(you),頗足傲于當世之(zhi)作”。1956年(nian)四川省人民政府公布為(wei)文物保護(hu)單(dan)(dan)位(wei)。 2006年(nian)05月25日(ri),旋螺殿作為(wei)明(ming)代(dai)古建筑(zhu),被國(guo)務(wu)院批準列(lie)入第六批全國(guo)重點文物保護(hu)單(dan)(dan)位(wei)名單(dan)(dan)。