The utility model relates to a material transport part for a pebble coal pneumatic transport system in a heat-engine plant, in particular to a two-channel adjustable pebble coal feeding device, comprising a shell. The top of the shell is provided with a feeding hole communicated with a pebble coal hopper, the rear end of the shell is provided with an air inlet, and the front end of the shell is provided with a discharge hole communicated with a negative pressure pipeline of a pneumatic transport system. A first-level material receiving tray is arranged in the middle of the inner cavity of the shell below the feeding hole, and an air inlet adjusting plate is arranged between the first-level material receiving tray and the air inlet. The front end of the air inlet adjusting plate is articulated with the shell, and an included angle of the air inlet adjusting plate and a horizontal air inlet direction is adjustable and can be fixed at different angle positions. The utility model has the advantages of simple structure, high transport speed, large suitable grain size range of the pebble coal, adjustable transport condition and high operation reliability.