The invention relates to a method for testing weather resistance of a coating in dry-heat environment and a system thereof. The method comprises the following steps of: sequentially performing ageingresistant test and temperature shock resistant test on the coating, and circulating the tests for 3-9 times, wherein the ageing resistant test is an ultraviolet ageing test, the test condition of theultraviolet ageing test is that the radiation intensity is 0.89 W/m<2>-1.10 W/m<2>@340 nm, the blackboard temperature is 50-50 DEG C, the test duration in each circulation is 200-270 h, and the test condition of the temperature shock resistant test is that the temperature at a high-temperature stage is 50-80 DEG C, the temperature at a low-temperature stage is -40 to -20 DEG C, the temperature change rate is 0.8 DEG C/m/n to 1.2 DEG C/m/n, the exposure duration is 0.5 h to 1.5 h, and the temperature change test development cycle in the each circulation is 3-9 times. Through the method disclosed by the invention, the weather resistance of the coating under the dry-heat environment can be accurately determined.