The invention discloses a coagulating agent for coking wastewater treatment and a process for applying the same. The coagulating agent for coking wastewater treatment is compounded by using ferrous sulfate, aluminium sulfate, ferric chloride, polysilicate and zeolite powder as raw materials; and the coagulating agent comprises the following raw materials in percentage by mass: 30 to 70 percent ofthe ferrous sulfate, 20 to 60 percent of the aluminium sulfate, 3 to 10 percent of the ferric chloride, 1 to 5 percent of the polysilicate and 1 to 5 percent of the zeolite powder. The application process comprises that: in a coagulating treatment stage after coking wastewater is subjected to A/O biological treatment, the PH value of the coking wastewater subjected to A/O biological treatment is regulated to be between 6 and 9; and the coagulating agent for coking wastewater treatment is added into the coking wastewater for coagulation treatment so that the final concentration of the coagulating agent for coking wastewater treatment in the coking wastewater is between 900 and 1,500 mg/L. Compared with the other coagulating agents, the coagulating agent has high efficiency, economization and excellent coagulating effect; and the application process is simple and has low investment cost.