The invention relates to the technical field of sweater circulating cooling water treatment, and particularly relates to an integrated mobile seawater circulating cooling water treatment chemical evaluating device and method. The integrated mobile seawater circulating cooling water treatment chemical evaluating device comprises a water replenishing system, a heat exchanging system, a cooling tower system, a sewage blowdown system, a chemical adding system and a monitoring system. The integrated mobile seawater circulating cooling water treatment chemical evaluating device is characterized by being arranged in a container, wherein the monitoring unit comprises a corrosion monitoring unit arranged on a circulating water pipeline of a heat exchanging unit, the heat exchanging unit comprises a boiler condenser integrated part (15') used for simulating a power system and a chemical engineering system, and a simulation monitoring heat exchanger (15) and a steam condenser (16), wherein the simulation monitoring heat exchanger (15) is used for simulating the chemical engineering system. The integrated mobile seawater circulating cooling water treatment chemical evaluating device can achieve online monitoring of multiple parameters (temperature, flow, pressure, pH, conductivity, corrosion rate, fouling resistance and the like) of a sweater circulating cooling water treatment process, and automatic control of multiple tasks (chemical adding, sewage discharging, water replenishing, liquid level, water balance and the like).