Hainan Haikou used car market. Haikou used car trading market in Hainan Province is a used car trading center located in Haikou City, Hainan Province. Located at the intersection of Nanhai Avenue and Haiken Road, it is also one of the largest used car trading markets in the province. You can buy a tablet here. Haikou is a prefecture-level city and provincial capital under the jurisdiction of China people and Hainan Province.