The invention discloses bulk cargo receiving and unloading equipment and a balance arm frame system thereof. According to the technical scheme, the bulk cargo receiving and unloading equipment is mainly characterized by comprising a main bracket and furthermore comprises a main arm, a connection arm, an auxiliary arm and a swing arm drive portion, one end of the main arm is a main connection end hinged to the main bracket, and the other end of the main arm is a work end; the auxiliary arm is provided with an auxiliary connection end close to the work end, a hinge end hinged to the main bracket and a load bearing end away from the work end in sequence in the length direction, the load bearing end is provided with a heavy object, one end of the connection arm is hinged to the auxiliary connection end, and the other end of the connection arm is hinged to the main arm; and the swing arm drive portion is used for driving the main arm to move and making the work end achieve vertically lifting movement. An internal parallelogram structure is utilized by the balance arm frame system, and steadiness in the movement process is greatly improved; the internal power of a main supporting rod with an automatic oil smearing function is from action of the internal parallelogram structure of the balance arm frame system, automatic outer-side oil smearing is performed on a cylindrical shaft, and operation steadiness of the bulk cargo receiving and unloading equipment is guaranteed.