The invention discloses a pulley block combining structure, a lifting hook and a lifting device. The pulley block combining structure comprises a connecting balance beam, a first pulley block assembly and a second pulley block assembly. The number of pulley blocks of the first pulley block assembly and the number of pulley blocks of the second pulley block assembly are different; the connecting balance beam comprises a plurality of connecting parts, and the multiple connecting parts include the first connecting part, the second connecting part and the third connecting part; in the horizontal direction, the first connecting part and the second connecting part are arranged on the two sides of the third connecting part respectively, the first pulley block assembly is connected with the first connecting part, the second pulley block assembly is connected with the second connecting part, and the horizontal distance from the first connecting part to the third connecting part is not equal to the horizontal distance from the second connecting part to the third connecting part so that the moment borne by the first connecting part relative to the third connecting part and the moment borne by the second connecting part relative to the third connecting part can be equal. By means of the pulley block combining structure, as the connecting balance beam is arranged, the balance of more pulley blocks with different numbers can be achieved through the lifting hook.