The invention discloses a bearing seat at the bottom of a spiral feeder, which comprises a chassis and a transition flange, wherein the chassis is convexly provided with a bearing and a chassis rotating hole; end surfaces are formed at the edges of the bearing, the chassis rotating hole and the chassis; the top surface of the bearing and the chassis rotating hole is provided with a pressing cover; a first through hole communicated with the bearing and the chassis rotating hole is formed on the pressing cover; the interior of the transition flange is mutually communicated with the interior of the chassis; the lower end surface of the transition flange is provided with a second through hole which is coaxial to the first through hole; the second through hole on the lower end surface of the transition flange is sheathed on the periphery of the bearing and the chassis rotating hole and arranged on the end surface; the upper end surface of the transition flange is provided with a cushion block; and the cushion block is provided with a third through hole which is coaxial to the second through hole. The bearing seat increases the rotation space and distance of the bearing on the original basis, so that powdery materials can not block the rotation space of the bearing because of leakage in the conveying process, and the bearing can continuously rotate without being influenced. Thus, the bearing and a motor are effectively protected.