三重檐(yan)(yan)(yan)(yan)八(ba)角攢尖頂,高25米,屋(wu)面鋪(pu)筒瓦(wa)兼(jian)小青瓦(wa)。殿(dian)(dian)平面呈(cheng)八(ba)方形,面闊、進深均為(wei)8米。殿(dian)(dian)內(nei)(nei)結構與一(yi)(yi)般廟(miao)宇不(bu)同,用(yong)(yong)四井(jing)口柱(zhu)直貫二(er)層(ceng)(ceng),井(jing)口柱(zhu)間施抬(tai)梁(liang)(liang)(liang)、穿枋(fang)(fang)、角梁(liang)(liang)(liang)連(lian)接(jie)(jie)(jie),形成梁(liang)(liang)(liang)架骨干。第一(yi)(yi)層(ceng)(ceng)抬(tai)梁(liang)(liang)(liang)承(cheng)(cheng)接(jie)(jie)(jie)殿(dian)(dian)內(nei)(nei)楞木樓板,東西兩(liang)梁(liang)(liang)(liang)下附(fu)梁(liang)(liang)(liang)枋(fang)(fang),8根采步(bu)梁(liang)(liang)(liang)上(shang)立中層(ceng)(ceng)檐(yan)(yan)(yan)(yan)柱(zhu)8根,上(shang)承(cheng)(cheng)掾枋(fang)(fang),下附(fu)檐(yan)(yan)(yan)(yan)掾;檐(yan)(yan)(yan)(yan)枋(fang)(fang)上(shang)為(wei)中檐(yan)(yan)(yan)(yan)斗(dou)拱。第二(er)層(ceng)(ceng)抬(tai)梁(liang)(liang)(liang)承(cheng)(cheng)接(jie)(jie)(jie)頂層(ceng)(ceng)檐(yan)(yan)(yan)(yan)柱(zhu)8根,檐(yan)(yan)(yan)(yan)柱(zhu)平板枋(fang)(fang)上(shang)置拱,坐斗(dou)外側為(wei)外檐(yan)(yan)(yan)(yan)斗(dou)拱,內(nei)(nei)側構成網目(mu)狀(zhuang)的(de)藻井(jing),殿(dian)(dian)的(de)斗(dou)拱大致相同,層(ceng)(ceng)層(ceng)(ceng)而上(shang),內(nei)(nei)承(cheng)(cheng)梁(liang)(liang)(liang)架,外挑檐(yan)(yan)(yan)(yan)枋(fang)(fang)。頂部藻井(jing),八(ba)面均用(yong)(yong)斗(dou)拱。其左側用(yong)(yong)如意斗(dou)拱,右側斜(xie)翅(chi)和斗(dou)拱后尾向上(shang)重疊(die)呈(cheng)網目(mu)狀(zhuang),并向右旋(xuan)(xuan)轉,形如旋(xuan)(xuan)螺(luo),故殿(dian)(dian)有此名。殿(dian)(dian)內(nei)(nei)檻墻有清代碑刻(ke)5通,內(nei)(nei)容多(duo)為(wei)記述(shu)歷代培修旋(xuan)(xuan)螺(luo)殿(dian)(dian)的(de)情況。
在(zai)殿(dian)內第一(yi)層二井(jing)口柱間抬梁上有(you)“明萬歷二十四年(nian)(nian)(nian)丙申八月(yue)殿(dian)成”題(ti)記(ji)。四十年(nian)(nian)(nian)代(dai),古(gu)建(jian)筑(zhu)(zhu)(zhu)學家梁思(si)成、莫(mo)宗江曾(ceng)對殿(dian)進行考察,在(zai)《中國(guo)營造學社》七卷一(yi)期上,撰(zhuan)文(wen)稱該建(jian)筑(zhu)(zhu)(zhu)“梁柱結構之優,頗足傲(ao)于當(dang)世(shi)之作”。1956年(nian)(nian)(nian)四川(chuan)省人民政府公布為文(wen)物(wu)保護單位。 2006年(nian)(nian)(nian)05月(yue)25日(ri),旋螺殿(dian)作為明代(dai)古(gu)建(jian)筑(zhu)(zhu)(zhu),被國(guo)務(wu)院(yuan)批準列入第六批全國(guo)重點(dian)文(wen)物(wu)保護單位名單。