The invention discloses a novel building construction device. The novel building construction device comprises a containing box fixedly installed on a rack; a containing cavity is formed in the containing box; a fixing column extending leftwards and rightwards is fixedly installed on the bottom wall of the containing cavity; a bucket cavity located below the fixing column and communicated with thecontaining cavity is formed in the bottom wall of the containing cavity; a middle point shaft extending up and down is rotationally installed at the middle point position of the top wall of the containing cavity; the upper end of the middle point shaft is connected with a motor fixedly installed on the top end face of the containing box; the lower end of the middle point shaft is rotationally installed in the fixing column and extends downwards into the bucket cavity; the bucket cavity is internally provided with an inclined rod fixedly connected with the middle point shaft; an upper uniformstirring arm and a lower uniform stirring arm extending leftwards and rightwards are fixedly installed on the middle point shaft in a left-right corresponding manner; and an outer uniform stirring armand an inner uniform stirring arm extending up and down are fixedly installed between the upper uniform stirring arm and the lower uniform stirring arm.