三重檐(yan)(yan)(yan)(yan)八(ba)角攢尖頂(ding),高25米(mi),屋面鋪筒瓦(wa)兼小青瓦(wa)。殿(dian)平面呈八(ba)方形,面闊、進深均(jun)為(wei)8米(mi)。殿(dian)內(nei)結(jie)構與一(yi)般(ban)廟宇不同(tong),用四井(jing)口柱(zhu)(zhu)直貫二(er)層,井(jing)口柱(zhu)(zhu)間施抬梁(liang)(liang)、穿枋(fang)(fang)、角梁(liang)(liang)連接,形成(cheng)梁(liang)(liang)架骨(gu)干。第一(yi)層抬梁(liang)(liang)承(cheng)接殿(dian)內(nei)楞木樓(lou)板,東西(xi)兩梁(liang)(liang)下附梁(liang)(liang)枋(fang)(fang),8根采步梁(liang)(liang)上(shang)立中層檐(yan)(yan)(yan)(yan)柱(zhu)(zhu)8根,上(shang)承(cheng)掾枋(fang)(fang),下附檐(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)(dou)拱(gong)(gong)。第二(er)層抬梁(liang)(liang)承(cheng)接頂(ding)層檐(yan)(yan)(yan)(yan)柱(zhu)(zhu)8根,檐(yan)(yan)(yan)(yan)柱(zhu)(zhu)平板枋(fang)(fang)上(shang)置拱(gong)(gong),坐斗(dou)(dou)外側為(wei)外檐(yan)(yan)(yan)(yan)斗(dou)(dou)拱(gong)(gong),內(nei)側構成(cheng)網目狀(zhuang)的藻井(jing),殿(dian)的斗(dou)(dou)拱(gong)(gong)大致相同(tong),層層而上(shang),內(nei)承(cheng)梁(liang)(liang)架,外挑檐(yan)(yan)(yan)(yan)枋(fang)(fang)。頂(ding)部藻井(jing),八(ba)面均(jun)用斗(dou)(dou)拱(gong)(gong)。其(qi)左側用如意斗(dou)(dou)拱(gong)(gong),右(you)側斜翅和斗(dou)(dou)拱(gong)(gong)后尾向(xiang)上(shang)重疊呈網目狀(zhuang),并(bing)向(xiang)右(you)旋(xuan)(xuan)轉,形如旋(xuan)(xuan)螺,故殿(dian)有此(ci)名。殿(dian)內(nei)檻(jian)墻有清代碑刻(ke)5通,內(nei)容多為(wei)記述(shu)歷代培修旋(xuan)(xuan)螺殿(dian)的情況。
在(zai)(zai)殿(dian)內第(di)一(yi)層二井口柱(zhu)間抬梁上(shang)有“明萬歷二十(shi)四年丙申八月殿(dian)成”題記。四十(shi)年代,古建筑學家梁思成、莫宗(zong)江(jiang)曾對(dui)殿(dian)進行考察,在(zai)(zai)《中國(guo)營造學社》七(qi)卷(juan)一(yi)期上(shang),撰文(wen)(wen)(wen)稱該建筑“梁柱(zhu)結構之(zhi)(zhi)優,頗足(zu)傲于當世(shi)之(zhi)(zhi)作”。1956年四川省(sheng)人(ren)民(min)政府公布為文(wen)(wen)(wen)物保(bao)護(hu)單(dan)位。 2006年05月25日,旋螺殿(dian)作為明代古建筑,被(bei)國(guo)務院(yuan)批(pi)準列入第(di)六(liu)批(pi)全國(guo)重點文(wen)(wen)(wen)物保(bao)護(hu)單(dan)位名單(dan)。