The invention provides a forklift head mechanism for auxiliary installation of an electric control cabinet and an operation method. The forklift head mechanism comprises a vehicle frame used for beingfixedly connected with a mobile vehicle body. A transverse moving device is mounted on the vehicle frame. A movable cross beam is mounted on the transverse moving device. A supporting cross beam of the movable cross beam is fixedly provided with an angle adjusting mechanism used for adjusting the angle of the electric control cabinet. A rotary frame is mounted on the angle adjusting mechanism. Asupporting device used for supporting the electric control cabinet is mounted on the rotary frame. The forklift head mechanism can be matched with an existing forklift body to complete auxiliary information of the large electric control cabinet in a workshop with a limited hoisting space. The installation efficiency and installation quality of the large electric control cabinet are greatly improved. The labor intensity of operators is reduced. Operation safety is ensured.