The invention discloses a foot pedal operating mechanism which comprises the components of a foot pedal, a mounting board, a pin, a supporting seat and a pull rod. Positioning connection between the foot pedal and the supporting seat is realized through the pin. The pull rod is connected with the foot pedal through a bolt. The mounting board is fixed on the floor of a driver cab. The mounting board is provided with a rabbet. The length of the rabbet is larger than the working stroke of the foot pedal. The foot pedal has a panel which is made of a bent board. A rubber protective sleeve is mounted outside the foot pedal, so that the foot pedal is more suitable for force application by a human foot. Furthermore, multiple connecting holes between the foot pedal and the pull rod are arranged. The magnitude of a control force is changed through mounting in different holes, thereby satisfying the requirements of different operators. Integral milling is applied on the supporting seat, thereby effectively settling a transverse idle stroke of the foot pedal. A ball joint rod ends bearing is adopted at the connection portion between the pull rod and the foot pedal. The position relationship between the pull rod and a valve core is better adjusted. The foot pedal operating mechanism has advantages of simple structure, high reliability, attractive appearance, etc. Furthermore the operability of the foot pedal operating mechanism is greatly improved.