The invention provides a communication antenna mounting support and a power communication shared tower with the same, and belongs to the technical field of power and communication engineering. The communication antenna mounting support comprises a horizontal support, support diagonal bracings and reverse diagonal bracings; the first end of the horizontal support is connected with the end of a cross arm, and the second end of the horizontal support is connected with the lower part of an antenna; the first ends of the support diagonal bracings are connected with the lower end face of the cross arm, and the second ends of the support diagonal bracings are connected with the upper part of the antenna; and the reverse diagonal bracings are arranged between the horizontal support and the supportdiagonal bracings. Through connecting cooperation of the horizontal support, the support diagonal bracings and the reverse diagonal bracings, the communication antenna is mounted on the power communication shared tower without being sheltered and can also be folded up, and the phenomenon that a power transmission line is forced to be subjected to a power failure due to antenna overhauling is avoided.