三重檐(yan)八(ba)角攢尖頂(ding),高25米,屋(wu)面鋪筒瓦(wa)(wa)兼小青瓦(wa)(wa)。殿(dian)平(ping)面呈八(ba)方形,面闊、進深均為(wei)8米。殿(dian)內(nei)(nei)結構與一(yi)(yi)般廟宇不(bu)同,用四井(jing)口柱直貫(guan)二層(ceng),井(jing)口柱間施抬(tai)梁(liang)(liang)、穿枋(fang)(fang)、角梁(liang)(liang)連接(jie),形成梁(liang)(liang)架(jia)骨干。第一(yi)(yi)層(ceng)抬(tai)梁(liang)(liang)承接(jie)殿(dian)內(nei)(nei)楞木樓板(ban),東西兩梁(liang)(liang)下附梁(liang)(liang)枋(fang)(fang),8根(gen)采步梁(liang)(liang)上立中(zhong)層(ceng)檐(yan)柱8根(gen),上承掾枋(fang)(fang),下附檐(yan)掾;檐(yan)枋(fang)(fang)上為(wei)中(zhong)檐(yan)斗(dou)拱(gong)(gong)(gong)。第二層(ceng)抬(tai)梁(liang)(liang)承接(jie)頂(ding)層(ceng)檐(yan)柱8根(gen),檐(yan)柱平(ping)板(ban)枋(fang)(fang)上置拱(gong)(gong)(gong),坐(zuo)斗(dou)外(wai)側(ce)(ce)為(wei)外(wai)檐(yan)斗(dou)拱(gong)(gong)(gong),內(nei)(nei)側(ce)(ce)構成網(wang)目狀的藻井(jing),殿(dian)的斗(dou)拱(gong)(gong)(gong)大致(zhi)相同,層(ceng)層(ceng)而(er)上,內(nei)(nei)承梁(liang)(liang)架(jia),外(wai)挑(tiao)檐(yan)枋(fang)(fang)。頂(ding)部(bu)藻井(jing),八(ba)面均用斗(dou)拱(gong)(gong)(gong)。其(qi)左側(ce)(ce)用如(ru)意斗(dou)拱(gong)(gong)(gong),右(you)側(ce)(ce)斜翅和斗(dou)拱(gong)(gong)(gong)后尾向上重疊(die)呈網(wang)目狀,并(bing)向右(you)旋(xuan)(xuan)轉,形如(ru)旋(xuan)(xuan)螺,故(gu)殿(dian)有(you)此名(ming)。殿(dian)內(nei)(nei)檻(jian)墻有(you)清代碑刻5通,內(nei)(nei)容多(duo)為(wei)記述歷代培修旋(xuan)(xuan)螺殿(dian)的情況。
在殿內第一層二井口柱(zhu)間(jian)抬梁上有“明萬(wan)歷二十(shi)四年(nian)丙申八月殿成”題(ti)記。四十(shi)年(nian)代,古建筑學家(jia)梁思(si)成、莫宗江曾(ceng)對殿進行考察,在《中國營造學社》七卷一期上,撰文稱該建筑“梁柱(zhu)結構之優,頗(po)足傲(ao)于(yu)當世之作”。1956年(nian)四川省人民政府公布為(wei)文物(wu)保護單(dan)位。 2006年(nian)05月25日(ri),旋螺殿作為(wei)明代古建筑,被國務院批準列(lie)入(ru)第六批全國重點文物(wu)保護單(dan)位名單(dan)。