Silicon electrolytic bath for preparing high-purity silicon and silicon preparation method

The invention relates to a silicon electrolytic bath for preparing high-purity silicon and a silicon preparation method. The silicon electrolytic bath comprises three operation chambers, that is, the cathode pre-heating chamber, the middle operation chamber and the crystalline silicon cooling chamber which are arranged on the same layer, a folding door is arranged between every two adjacent operation chambers, and an electrolytic reaction chamber communicating with the middle operation chamber is arranged under the middle operation chamber. The electrolytic reaction chamber is internally provided with a fused electrolyte, an anode device is arranged in the fused electrolyte and used for fixing an anode pole piece, and the anode pole piece is connected with a positive pole of a direct current supply system through an anode connection wire. The upper portions inside the cathode pre-heating chamber, the middle operation chamber and the crystalline silicon cooling chamber are provided with tracks, the tracks are provided with movable cathode moving devices, cathode buses are arranged on the cathode moving devices, the lower portions of the cathode buses are connected with cathode devices through cathode guide rods, and the cathode devices are used for fixing cathode pole pieces. The silicon electrolytic bath for preparing the high-purity silicon, and the silicon preparation method have the advantages that the process is simple, operation is convenient, the mechanization degree and the automation degree are high, and environmental protection and energy saving are achieved.