The invention relates to a floater production process and a floater. The production process comprises the following steps: (S101) materials are prepared; (S102) a floater main body is prepared; (S103)the floater main body is taken out and dipped in frozen water for cooling; (S104) the floater main body is aired; and a magnet is arranged in the floater main body; (S105) the floater main body is arranged in a second mold; plastic raw materials are injected; and the magnet is closed in the floater main body to finish secondary injection molding; and (S106) a finished product of the floater is obtained through cooling. The floater comprises the magnet and the floater main body; the floater main body is of a cylindrical structure, and is provided with a positioning groove for accommodating themagnet; the positioning groove is positioned at the middle part of the floater main body; the magnet is sealed in the floater main body through a sealing piece; and the sealing piece and the floatermain body adopt the same materials. The production process solves the problem that the magnet can be damaged by external factors in a long-time sealing state in the prior art.