Tool for installing cross arm conveniently

The invention discloses a tool for installing a cross arm conveniently. The tool comprises a fastening assembly, an adjusting assembly and a bearing assembly, wherein the adjusting assembly comprises a supporting piece and a connecting rod, the supporting piece is arranged on the side face of the fastening assembly, and the supporting piece is connected with the fastening assembly through the connecting rod; and the bearing assembly comprises a bearing frame and a limiting piece, the bearing frame is arranged at the end, away from the fastening assembly, of the supporting piece, and the limiting piece is arranged in the bearing frame. According to the tool for installing the cross arm conveniently, the fastening assembly is matched with the adjusting assembly, an electric pole can be rapidly and tightly held, whether the cross arm is in the horizontal position or not is checked through a horizontal detection observer, the cross arm is leveled through the adjusting assembly, a fixing hoop is additionally insta