This research used three technical means of hollow bricks, customized bamboo basket I and customized bamboo basket II to carry out the mangrove restoration test under difficult site condition in Shenzhen Bay in 2016. The effect of plantation was evaluated in terms of colonization technology, economic cost, mangrove population characteristics and sediment environmental quality after 4 years. The results showed that 1) three technical methods in the mangrove plantation area could create an Aegiceras corniculatum restoration. The preservation rate of A. corniculatum gained over 87%. 2) The cost of the hollow brick technology was lower than those of the groups of customized bamboo basket I and customized bamboo basket II. 3) The total organic (TOC) and total phosphorus (TP) of the sediments in the mangrove planting area were significantly higher than those in the intertidal zone, which indicated that mangroves could promote the retention of organic matter and phosphorus and reduce the risk of their escape to the offshore marine environment. The conclusion is that the technical means of hollow bricks, customized bamboo basket I and customized bamboo basket II can successfully restore mangroves under the difficult site condition of Shenzhen Bay. Considering the restoration effect and economic cost, it is recommended to use hollow brick technology to restore mangrove under difficult site conditions.