Mounting structure of circuit board of controller

The invention discloses a mounting structure of a circuit board of a controller. The structure comprises a film, an upper cover, a circuit board a, a circuit board b and a lower shell, wherein a display module and an operating button are mounted on the circuit board b, a film mounting groove is formed in the upper cover, and a display module mounting hole and an operation button hole are formed inthe film mounting groove; a plurality of upper cover stretching ends in contact with the circuit board a are arranged in the upper cover; a plurality of supporting columns are distributed in the lower shell and are composed of three concentric cylinders, the diameters of which are successively reduce from top to bottom, elastic rings a are mounted on round ring step surfaces where the lower and middle sections of the supporting columns are connected, a positioning hole a matched with the middle section of each supporting column is formed in the circuit board a and is formed in the middle section of the supporting col