Cross arm clamping fixture for live-line replacement of 220 kV linear string whole insulator string

The utility model discloses a cross arm clamping fixture for live-line replacement of a 220 kV linear string whole insulator string. The apparatus comprises a telescoping clamping fixture (1), screw rods (2), movable handles (3) and a connecting rod (4), wherein the telescoping clamping fixture (1) comprises two symmetrically arranged clamping bocks (1.1), the clamping blocks (1.1) comprise two base plates (1.2) and backup plates (1.3) which are vertically connected, and two rib plates (1.4) are connected between the base plates (1.2) and the backup plates (1.3); the outer sides of the base plates of the clamping blocks are provided with connecting grooves (5) for the screw rods to pass through, the end portions of the connecting grooves (5) of the base plates are provided with screw holes (6), and after the screw rods (2) are connected to the connecting grooves (5), the screw rods (2) are limited by use of screws (7) through the screw holes (6). The cross arm clamping fixture provided by the utility model ha