The invention discloses a system for providing mobile electric power. Equipment needed by mobile electric power is integrated on three transportation tools, so that one overall transportation can be combined, the connecting time needed by field operation is greatly shortened, and combination flexibility and high adaptability are achieved. An exhaust system can perform side connection and also canperform top connection, so the connection mode is flexible; and a gas inlet system is axially connected with a gas turbine engine and an electric generator, so that unnecessary bends are avoided, theloss of gas inlet pressure is small and the flowing direction is stable.