The utility model relates to a power transmission and transformation system maintenance cart relates to the power transmission and transformation system maintenance technology field, and main aim at is convenient for to power transmission and transformation system 's maintenance. Power transmission and transformation system maintenance cart includes: the automobile body has the control chamber in, pipe fitting tongs parts open and close up an actuating mechanism of motion and control an actuating mechanism's the first mechanism that controls including the first tongs that has the tongs mechanism that can open relatively and close up the motion, regulation tongs mechanism and second tongs, and the first establishment of institution of controlling is in the control chamber, moving arm members, controlling the mechanism including mobilizable swing arm mechanism, the second adjusting swing arm mechanism motion's the 2nd actuating mechanism and control the 2nd actuating mechanism, the establishment of institution is controlled in the control chamber to the second, and wherein the tongs establishment of institution is in swing arm mechanism. In the operation, can keep sufficient safe distance with top and electrified line on every side, need not to have a power failure to changing the neighbouring generating line circuit of circuit breaker.