The invention provides a pipeline system of a gravity fluidized bed for transportation of a powder curing agent and a using method thereof. The pipeline system of the gravity fluidized bed is composedof a fluidized bed pipeline, a feeding hopper and air circulating compressor, wherein the fluidized bed pipeline is internally divided into three independent channels: an air inlet channel, a mediumtransportation channel and a gas recovery channel. The pipeline system of the gravity fluidized bed is used for cured construction of soil masses in geotechnical engineering and primarily solves the problem that the feeding channel is easily blocked in the injecting and mixing processes of the powder curing agent. By means of the principle of the fluidized bed, a proper amount of air is blown intothe powder, so that the powder has the characteristic of liquid flowing. The powder is transported forward obliquely under the action of gravity, so that the workload of manual feeding in the mechanical mixing process is reduced, the mixing uniformity and controllability are improved, the powder curing can be precisely injected according to a design demand, and the mechanical degree and the production efficiency are improved.