[LIAO, Zhenchao 廖振超, HE, Jianhong 何建红, ZHANG, Liping 张立平, YANG, Yuanpeng 杨远鹏, LIAO, Ji 廖继, TONG, Shufeng 佟树峰, CHEN, Lei 陈雷, WANG, Jun 王军, FENG, Jiefu 冯杰夫, LIN, Zhongming 林忠明, YANG, Boxuan 杨博轩, DU, Shuang 杜爽, QIU, Yue 邱越, JIA, Xujing 贾叙京, LI, Cankang 李灿康, CHEN, Ye 陈叶, WANG, Zhizhao 王智钊, GAN, Xiaoqin 甘晓琴, LI, Guoyin 李国银, WU, Lei 吴磊, CHEN, Lian 陈练] No. 2 Guannanyuan Road, Hongshan District 中国湖北省武汉市洪山区关南园路2号, Hubei 430070Wuhan, Hubei 430070;161 Qianjin Road, Haizhu District 中国广东省广州市海珠区前进路161号, Guangdong 510000Guangzhou, Guangdong 510000 Provided in the present invention is a new connecting and fixing structure suitable for precast columns. The new connecting and fixing structure comprises a lower-layer precast column, an upper-layer precast column and an L-shaped fixing bracket, wherein a column cap connected to a frame beam is provided at the top of the lower-layer precast column; a cup-mouth-shaped recess is formed in the top of the column cap; the upper-layer precast column is fixed to an upper surface of the column cap by means of the L-shaped fixing bracket; a reinforcing bar at the bottom of the upper-layer precast column extends into the cup-mouth-shaped recess and is in lap joint with a reinforcing bar at the top of the lower-layer precast column; the edge of a gap between the upper-layer precast column and the column cap is blocked with blocking mortar; fine aggregate concrete with one grade higher than the concrete grade of a precast column is poured in the cup-mouth-shaped recess to a floor level elevation; the gap between the upper-layer precast column and the column cap is filled with a grouting material; and upper surfaces of the upper-layer precast column and the column cap are both connected to the L-shaped fixing bracket by means of bolts, and threaded sleeve metal members fitting with the bolts are pre-buried in the upper-layer precast column and the column cap. Further provided in the present invention is an implementation method for the new connecting and fixing structure suitable for precast columns.