The invention relates to a soft rock-stratum small-section tunneling advance supporting technology and belongs to the technical field of roadway mining safety. The soft rock-stratum small-section tunneling advance supporting technology is characterized in that the technology comprises the following steps: preparing supporting materials of a top plate, drilling supporting holes, jacking a steel pipe into the supporting holes, drilling and blasting, deslagging, carrying out secondary explosion and carrying out permanent supporting work. The construction sequence of the soft rock-stratum small-section tunneling advance supporting technology comprises the following steps: firstly, carrying out the support of the roadway top plate; drilling and blasting; and forming a top plate pre-supporting space after the completion of the explosion, so that the security of staffs who work under the working surface is improved, the pressure-bearing of the top plate is enlarged and the possibility of roof fall is reduced and the problems of drilling under the soft rock-stratum tunneling hollow top and large dangerous coefficient of deslagging top plate are solved, and therefore, the permanent supporting work is convenient, and the tunneling speed is improved.