The invention relates to the technical field of battery testing, and discloses a new energy automobile motor battery simulation test device and method. The device comprises an electronic load and a charger which are respectively connected with a battery under test through a switch, and is characterized by further comprising an upper computer, a battery detection circuit and a temperature controllable box, wherein the battery detection circuit detects voltage and through current at two ends of the battery under test, the battery under test is placed in the temperature controllable box, and thetemperature controllable box is electrically connected with the upper computer; the upper computer is electrically connected with the charger and the electronic load, and the upper computer acquires adetected value of the battery detection circuit and controls a charging current value of the charger, a resistance value of the electronic load and the temperature in the temperature controllable box. According to the invention, the SOC (State of Charge) of the battery is calculated by adopting an ampere-hour integration method, the DC internal resistance of the battery is calculated by using open-circuit voltage, and the upper computer directly generates an operating characteristic curve diagram of the battery after the testing. The new energy automobile motor battery simulation test deviceand method are applicable to various automobile batteries, can simulate various battery operating occasions, are convenient for performing different tests on the batteries and save the time and effortof researchers.