The invention discloses an anticorrosive coating high-temperature and high-pressure resistant performance evaluation testing device and testing method, and belongs to the technical field of metal anticorrosive coating performance detection. An experiment device mainly comprises a heating system, a temperature control system, a pressurization system, a pressure measurement system, a high-pressure valve and a pipeline. The testing method mainly comprises the following steps: putting a to-be-inspected coating specimen into a testing barrel, then sealing a testing barrel cap, and heating and pressurizing the testing barrel by a pressurization pump and the heating system; keeping the temperature and pressure according to the experiment requirement after the temperature and pressure in the barrel reach a stipulated condition until the complete of the experiment; and finally, taking out the specimen, and inspecting the variation of each performance of the coating. The anticorrosive coating high-temperature and high-pressure resistant performance evaluation testing device and testing method can truly simulate the high-temperature and high-pressure environments when the anticorrosive coating is applied in oil and gas exploitation process, and provide a novel method and basis for accurately and efficiently evaluating the high-temperature and high-pressure performances in a laboratory.