Ferrous activation persulfate slow-release candle for underground water in-situ oxidation restoration

The invention discloses a ferrous activation persulfate slow-release candle for underground water in-situ oxidation restoration. The ferrous activation persulfate slow-release candle is in a cylindrical shape, is prepared from oxidizers, activators, dispersing agents and coagulators, and is formed by sequentially melting and connecting an oxidizer slow release layer and an activator slow release layer; the activators are persulfates; the activators consist of ferrous ion compounds, zero-valent iron powder and high iron powder coal ash, and have the ferrous and magnet self activation function. After the ferrous activation persulfate slow-release candle is in contact with water, the self activation can be realized; the controllable sulfate radical free radical flow release capability is realized, so that the candle is applicable to the underground water in-situ oxidation restoration of different organic pollution fields.