三重(zhong)檐(yan)(yan)八角攢尖頂,高25米,屋面鋪筒瓦兼小青瓦。殿(dian)(dian)平面呈(cheng)八方(fang)形(xing),面闊、進(jin)深均為(wei)8米。殿(dian)(dian)內(nei)結構與一般廟宇(yu)不同,用四井口柱(zhu)直貫二層(ceng),井口柱(zhu)間施抬(tai)梁(liang)(liang)、穿枋(fang)、角梁(liang)(liang)連接,形(xing)成梁(liang)(liang)架骨干。第一層(ceng)抬(tai)梁(liang)(liang)承(cheng)(cheng)接殿(dian)(dian)內(nei)楞木樓板,東西兩梁(liang)(liang)下(xia)附梁(liang)(liang)枋(fang),8根(gen)采(cai)步梁(liang)(liang)上(shang)(shang)(shang)立中層(ceng)檐(yan)(yan)柱(zhu)8根(gen),上(shang)(shang)(shang)承(cheng)(cheng)掾枋(fang),下(xia)附檐(yan)(yan)掾;檐(yan)(yan)枋(fang)上(shang)(shang)(shang)為(wei)中檐(yan)(yan)斗(dou)拱(gong)。第二層(ceng)抬(tai)梁(liang)(liang)承(cheng)(cheng)接頂層(ceng)檐(yan)(yan)柱(zhu)8根(gen),檐(yan)(yan)柱(zhu)平板枋(fang)上(shang)(shang)(shang)置拱(gong),坐斗(dou)外(wai)側(ce)為(wei)外(wai)檐(yan)(yan)斗(dou)拱(gong),內(nei)側(ce)構成網(wang)目狀(zhuang)的(de)藻井,殿(dian)(dian)的(de)斗(dou)拱(gong)大(da)致相同,層(ceng)層(ceng)而上(shang)(shang)(shang),內(nei)承(cheng)(cheng)梁(liang)(liang)架,外(wai)挑檐(yan)(yan)枋(fang)。頂部藻井,八面均用斗(dou)拱(gong)。其(qi)左(zuo)側(ce)用如(ru)意斗(dou)拱(gong),右(you)側(ce)斜翅和斗(dou)拱(gong)后尾向上(shang)(shang)(shang)重(zhong)疊呈(cheng)網(wang)目狀(zhuang),并(bing)向右(you)旋轉,形(xing)如(ru)旋螺,故殿(dian)(dian)有此名(ming)。殿(dian)(dian)內(nei)檻墻(qiang)有清代碑刻5通,內(nei)容(rong)多為(wei)記述(shu)歷(li)代培修旋螺殿(dian)(dian)的(de)情況。
在(zai)殿(dian)(dian)內第一層二(er)井口柱間抬梁上有“明萬(wan)歷二(er)十四年(nian)丙申(shen)八月殿(dian)(dian)成”題記。四十年(nian)代(dai),古(gu)建(jian)筑(zhu)學(xue)家梁思(si)成、莫(mo)宗(zong)江曾(ceng)對殿(dian)(dian)進行考察,在(zai)《中國(guo)(guo)營(ying)造(zao)學(xue)社(she)》七(qi)卷一期上,撰文(wen)稱該建(jian)筑(zhu)“梁柱結構之優,頗足傲于當(dang)世(shi)之作”。1956年(nian)四川省人民(min)政(zheng)府公布為(wei)文(wen)物保護單位。 2006年(nian)05月25日,旋螺殿(dian)(dian)作為(wei)明代(dai)古(gu)建(jian)筑(zhu),被國(guo)(guo)務院(yuan)批準列入第六(liu)批全國(guo)(guo)重點文(wen)物保護單位名單。