The utility model discloses a change device that in -process is used for supporting transmission pressure at pole, include portable crane, lift board, crossbeam and positioning channel section board, it fixes on portable crane top to lift the board, the crossbeam has at least two to be equipped with corresponding positioning channel section board respectively and the parallel is fixed on lifting the board on every crossbeam, positioning channel section board opening is fixed on the crossbeam up. After the staple bolt of the angle bar cross arm on dismantling impaired pole, the utility model discloses can lift the angle bar cross arm, the angle bar cross arm is built on stilts with the transmission pressure, has simplified the process for the pole of more renewing. For angle bar cross arm in preventing the work progress shifts, the electro -magnet in the draw -in groove of positioning channel section board can be tight with angle bar cross arm haulage clip, makes angle bar cross arm and transmission pressure remain original mounted position throughout, has reduced the operation degree of difficulty, can make fixing on new pole of transmission pressure convenient and fast.