三重(zhong)(zhong)檐(yan)(yan)八(ba)角攢尖頂(ding),高25米(mi),屋面(mian)鋪筒瓦兼小青瓦。殿(dian)(dian)平面(mian)呈八(ba)方形,面(mian)闊、進深均為(wei)8米(mi)。殿(dian)(dian)內(nei)(nei)(nei)(nei)結構(gou)與一般廟宇不(bu)同,用四井口柱直貫(guan)二(er)(er)層(ceng),井口柱間(jian)施抬(tai)梁、穿枋(fang)、角梁連(lian)接,形成(cheng)梁架骨干。第(di)一層(ceng)抬(tai)梁承接殿(dian)(dian)內(nei)(nei)(nei)(nei)楞木樓(lou)板,東西兩梁下附梁枋(fang),8根采步梁上(shang)立中層(ceng)檐(yan)(yan)柱8根,上(shang)承掾枋(fang),下附檐(yan)(yan)掾;檐(yan)(yan)枋(fang)上(shang)為(wei)中檐(yan)(yan)斗(dou)(dou)拱(gong)(gong)(gong)。第(di)二(er)(er)層(ceng)抬(tai)梁承接頂(ding)層(ceng)檐(yan)(yan)柱8根,檐(yan)(yan)柱平板枋(fang)上(shang)置拱(gong)(gong)(gong),坐斗(dou)(dou)外側(ce)(ce)(ce)為(wei)外檐(yan)(yan)斗(dou)(dou)拱(gong)(gong)(gong),內(nei)(nei)(nei)(nei)側(ce)(ce)(ce)構(gou)成(cheng)網目(mu)狀的(de)(de)藻井,殿(dian)(dian)的(de)(de)斗(dou)(dou)拱(gong)(gong)(gong)大(da)致相同,層(ceng)層(ceng)而(er)上(shang),內(nei)(nei)(nei)(nei)承梁架,外挑檐(yan)(yan)枋(fang)。頂(ding)部藻井,八(ba)面(mian)均用斗(dou)(dou)拱(gong)(gong)(gong)。其(qi)左側(ce)(ce)(ce)用如(ru)意斗(dou)(dou)拱(gong)(gong)(gong),右側(ce)(ce)(ce)斜(xie)翅和(he)斗(dou)(dou)拱(gong)(gong)(gong)后尾(wei)向(xiang)上(shang)重(zhong)(zhong)疊呈網目(mu)狀,并向(xiang)右旋(xuan)轉(zhuan),形如(ru)旋(xuan)螺(luo),故殿(dian)(dian)有此名。殿(dian)(dian)內(nei)(nei)(nei)(nei)檻(jian)墻有清(qing)代(dai)碑刻5通,內(nei)(nei)(nei)(nei)容多為(wei)記述歷代(dai)培修(xiu)旋(xuan)螺(luo)殿(dian)(dian)的(de)(de)情況(kuang)。
在(zai)殿內第(di)一層二(er)井口(kou)柱(zhu)間抬梁(liang)上(shang)有“明萬(wan)歷二(er)十(shi)四(si)年(nian)(nian)(nian)丙申八(ba)月殿成”題記(ji)。四(si)十(shi)年(nian)(nian)(nian)代,古建筑(zhu)學家梁(liang)思(si)成、莫(mo)宗江(jiang)曾(ceng)對殿進行考察,在(zai)《中(zhong)國(guo)營造(zao)學社(she)》七卷一期上(shang),撰(zhuan)文稱(cheng)該建筑(zhu)“梁(liang)柱(zhu)結構(gou)之優(you),頗(po)足傲于(yu)當世之作(zuo)”。1956年(nian)(nian)(nian)四(si)川省(sheng)人民政府公布為(wei)(wei)文物保(bao)護單(dan)位(wei)。 2006年(nian)(nian)(nian)05月25日,旋螺殿作(zuo)為(wei)(wei)明代古建筑(zhu),被國(guo)務院(yuan)批(pi)準列(lie)入(ru)第(di)六(liu)批(pi)全國(guo)重點(dian)文物保(bao)護單(dan)位(wei)名單(dan)。