三重檐八角(jiao)攢尖頂,高25米,屋面鋪筒瓦(wa)兼小青瓦(wa)。殿(dian)平(ping)面呈(cheng)八方形(xing)(xing),面闊、進深(shen)均為(wei)(wei)(wei)8米。殿(dian)內(nei)結構(gou)與一(yi)般廟宇不同,用四井口柱(zhu)直貫二層(ceng)(ceng),井口柱(zhu)間(jian)施抬(tai)梁(liang)(liang)、穿枋、角(jiao)梁(liang)(liang)連接,形(xing)(xing)成梁(liang)(liang)架骨干。第(di)(di)一(yi)層(ceng)(ceng)抬(tai)梁(liang)(liang)承接殿(dian)內(nei)楞木樓板,東西兩梁(liang)(liang)下(xia)附梁(liang)(liang)枋,8根(gen)采步梁(liang)(liang)上(shang)立中(zhong)(zhong)層(ceng)(ceng)檐柱(zhu)8根(gen),上(shang)承掾枋,下(xia)附檐掾;檐枋上(shang)為(wei)(wei)(wei)中(zhong)(zhong)檐斗(dou)拱。第(di)(di)二層(ceng)(ceng)抬(tai)梁(liang)(liang)承接頂層(ceng)(ceng)檐柱(zhu)8根(gen),檐柱(zhu)平(ping)板枋上(shang)置拱,坐斗(dou)外側為(wei)(wei)(wei)外檐斗(dou)拱,內(nei)側構(gou)成網目(mu)狀的(de)藻(zao)(zao)井,殿(dian)的(de)斗(dou)拱大(da)致相同,層(ceng)(ceng)層(ceng)(ceng)而上(shang),內(nei)承梁(liang)(liang)架,外挑(tiao)檐枋。頂部藻(zao)(zao)井,八面均用斗(dou)拱。其(qi)左側用如意斗(dou)拱,右側斜翅和斗(dou)拱后尾(wei)向(xiang)上(shang)重疊(die)呈(cheng)網目(mu)狀,并(bing)向(xiang)右旋轉,形(xing)(xing)如旋螺,故殿(dian)有(you)此名。殿(dian)內(nei)檻(jian)墻有(you)清代碑刻5通,內(nei)容多為(wei)(wei)(wei)記(ji)述歷代培修旋螺殿(dian)的(de)情況。
在(zai)殿內第(di)一層二(er)井口柱(zhu)間抬梁上有“明萬(wan)歷(li)二(er)十四(si)年(nian)丙申(shen)八月(yue)殿成(cheng)”題記。四(si)十年(nian)代,古建筑學家(jia)梁思成(cheng)、莫(mo)宗江曾對殿進(jin)行考察,在(zai)《中國(guo)營造學社(she)》七卷一期上,撰文稱該(gai)建筑“梁柱(zhu)結(jie)構之優,頗(po)足傲于當世之作”。1956年(nian)四(si)川(chuan)省人民政(zheng)府(fu)公布為文物(wu)保護單(dan)(dan)位。 2006年(nian)05月(yue)25日,旋螺殿作為明代古建筑,被(bei)國(guo)務(wu)院(yuan)批準列入(ru)第(di)六(liu)批全國(guo)重點文物(wu)保護單(dan)(dan)位名(ming)單(dan)(dan)。