The invention relates to a material conveying device, in particular to a tubular bag type fluidized bed device for a bulk powder material tank truck, which overcomes the shortcomings of the conventional large-chute type fluidized bed device. The tubular bag type fluidized bed device comprises a chute type fluidized bed consisting of tilting fluidized bed surfaces, wherein a master air chamber is arranged below the tilting fluidized bed surfaces; each tilting fluidized bed surface comprises a fluidized bed plane, a fluidized bed slope and a lateral bevel board which are laid by fluidized bed components; the fluidized bed component comprises a hollow tube bag type air chamber which is formed by connecting an air permeation layer and an enclosed later and provided with a corrugated lining plate; and one end of the hollow tube bag type air chamber of each fluidized bed component is provided with a blast pipe communicated with the master air chamber and the other end of the hollow tube bagtype air chamber is sealed by a trim strip. The fluidized bed device fully utilizes the tank space, reduces the center of gravity for car loaded, increases the load, reduces the tank capacity, increases the effective load volume; increases the fluidization area, facilitates the fluidization of the bulk materials, increases the unloading speed, and has the characteristics of convenience and safetyof operation, good working condition and the like.