三重檐(yan)(yan)八(ba)角攢尖頂(ding)(ding)(ding),高(gao)25米,屋面(mian)鋪筒(tong)瓦(wa)兼小(xiao)青瓦(wa)。殿平面(mian)呈八(ba)方(fang)形,面(mian)闊、進深(shen)均為(wei)(wei)8米。殿內(nei)結構與(yu)一般廟宇不同,用四井口(kou)(kou)柱直貫(guan)二層(ceng)(ceng)(ceng),井口(kou)(kou)柱間施抬梁(liang)、穿(chuan)枋(fang)、角梁(liang)連接,形成梁(liang)架(jia)骨干。第一層(ceng)(ceng)(ceng)抬梁(liang)承(cheng)(cheng)接殿內(nei)楞(leng)木(mu)樓板,東西兩梁(liang)下(xia)附(fu)梁(liang)枋(fang),8根采步梁(liang)上立(li)中層(ceng)(ceng)(ceng)檐(yan)(yan)柱8根,上承(cheng)(cheng)掾(yuan)枋(fang),下(xia)附(fu)檐(yan)(yan)掾(yuan);檐(yan)(yan)枋(fang)上為(wei)(wei)中檐(yan)(yan)斗(dou)(dou)拱。第二層(ceng)(ceng)(ceng)抬梁(liang)承(cheng)(cheng)接頂(ding)(ding)(ding)層(ceng)(ceng)(ceng)檐(yan)(yan)柱8根,檐(yan)(yan)柱平板枋(fang)上置拱,坐斗(dou)(dou)外(wai)側為(wei)(wei)外(wai)檐(yan)(yan)斗(dou)(dou)拱,內(nei)側構成網目(mu)狀(zhuang)的(de)藻井,殿的(de)斗(dou)(dou)拱大致(zhi)相同,層(ceng)(ceng)(ceng)層(ceng)(ceng)(ceng)而上,內(nei)承(cheng)(cheng)梁(liang)架(jia),外(wai)挑檐(yan)(yan)枋(fang)。頂(ding)(ding)(ding)部藻井,八(ba)面(mian)均用斗(dou)(dou)拱。其左側用如(ru)意斗(dou)(dou)拱,右側斜(xie)翅和斗(dou)(dou)拱后尾向(xiang)上重疊呈網目(mu)狀(zhuang),并向(xiang)右旋(xuan)轉,形如(ru)旋(xuan)螺(luo),故殿有此名。殿內(nei)檻墻(qiang)有清代(dai)碑刻5通,內(nei)容多為(wei)(wei)記述歷(li)代(dai)培修旋(xuan)螺(luo)殿的(de)情況。
在殿內第一層二井(jing)口柱間抬梁(liang)上有“明(ming)(ming)萬(wan)歷二十四(si)年(nian)丙申八(ba)月殿成”題記。四(si)十年(nian)代,古(gu)建(jian)(jian)筑(zhu)(zhu)學家梁(liang)思成、莫宗江曾對殿進行(xing)考察(cha),在《中國營(ying)造(zao)學社(she)》七卷一期上,撰(zhuan)文(wen)稱(cheng)該建(jian)(jian)筑(zhu)(zhu)“梁(liang)柱結構(gou)之優,頗足傲于當世(shi)之作”。1956年(nian)四(si)川省人民政府(fu)公布為(wei)文(wen)物保護單(dan)位(wei)。 2006年(nian)05月25日,旋螺殿作為(wei)明(ming)(ming)代古(gu)建(jian)(jian)筑(zhu)(zhu),被國務(wu)院批(pi)準列入第六批(pi)全國重點文(wen)物保護單(dan)位(wei)名單(dan)。