A disk generator comprises a first shell (110) and a second shell (120). The first shell and the second shell are buckled and fixed together to define an accommodating space. The disk generator further comprises a first magnet set (130) and a second magnet set (131), wherein the first magnet set (130) and the second magnet set (131) are arranged in the accommodating space, the plane where the first magnet set is located is parallel to the plane where the second magnet set is located, and magnetic fields which are same in direction are formed between the first magnet set and the second magnet set. An armature (140) which is parallel to the plane where the first magnet set is located is arranged between the first magnet set and the second magnet set. The armature comprises a board (141). A plurality of coils (160) which are located on a same plane and ranked into a circumference at equal intervals with the center of the board as the center are fixedly installed on the board. The coils are spiral, the plane where the coils are located is parallel to the board, and the coils are mutually electrically connected through circuits on the board. The armature in the disk generator is stable in rotation without being affected by magnetic resistance.