The invention discloses a capacitor assembling and fixing apparatus. The capacitor assembling and fixing apparatus comprises a base; an apparatus cavity is formed in the middle part of the base; a first driving motor is fixedly connected with the inner wall of the apparatus cavity; a first rotary shaft is rotationally connected with the inner wall of the apparatus cavity; a second rotary plate isfixed at the upper end of the first rotary shaft; a first rotary plate is welded on the output shaft of the first driving motor; a sector-shaped plate is fixed at the upper end of the first rotary plate; the axis of the first rotary plate coincides with the axis of the sector-shaped plate; a limiting rod is arranged on the edge of the first rotary plate; the distance from the limiting rod to the axis of the first rotary plate is slightly larger than the radius of the sector-shaped plate; four arc-shaped blocks are arranged on the edge of the second rotary plate at equal distances; and clampinggrooves matched with the size of the limiting rod are formed in the arc-shaped blocks. The capacitor assembling and fixing apparatus is reasonable in structural design, simple in operation, less in manual operation and capable of greatly improving the capacitor assembling efficiency and lowering capacitor damage.