全城(cheng)(cheng)(cheng)是一(yi)座400×400平方(fang)米(mi)(mi)(mi)的方(fang)形古(gu)城(cheng)(cheng)(cheng)址。城(cheng)(cheng)(cheng)墻四角(jiao)正處(chu)(chu)在東(dong)南(nan)西(xi)北(bei)方(fang)位線上。殘高4-5米(mi)(mi)(mi)底寬(kuan)15-20米(mi)(mi)(mi),城(cheng)(cheng)(cheng)之南(nan)北(bei)各一(yi)城(cheng)(cheng)(cheng)門(men)(men)。古(gu)城(cheng)(cheng)(cheng)內西(xi)北(bei)角(jiao)建有90×90平方(fang)米(mi)(mi)(mi)的正方(fang)形小城(cheng)(cheng)(cheng)(居民稱之為馬圈),東(dong)開門(men)(men),高處(chu)(chu)達3米(mi)(mi)(mi)多,底寬(kuan)5米(mi)(mi)(mi)。在城(cheng)(cheng)(cheng)內拾到大量戰國(guo)、秦漢(han)時代的陶片、貨幣、兵(bing)器、建筑(zhu)構件等。史料記載,此城(cheng)(cheng)(cheng)乃為戰國(guo)東(dong)漢(han)時代的古(gu)城(cheng)(cheng)(cheng),形制保存(cun)完好。土城(cheng)(cheng)(cheng)子這個地區名也由此城(cheng)(cheng)(cheng)而命之。
土城(cheng)子(zi)古城(cheng)由自治區文(wen)物保(bao)護單(dan)位(wei)升級文(wen)物保(bao)護單(dan)位(wei)。2013年5月3日,中(zhong)華(hua)人民共和國國務院公布第七批國家文(wen)物保(bao)護單(dan)位(wei),其中(zhong)土城(cheng)子(zi)古城(cheng)榜上。