The invention discloses a high-strength high-toughness low temperature-resistant prestressed steel bar, which structurally comprises a steel bar loop structure inclusion body, a pressure mechanics control position, a transmission tissue layer, a collection dense kettle body, a loose filter sand layer, a fixed jointing bar body, a center fixed bar body and a center ring fork fixed position. The steel bar loop structure inclusion body is provided with the pressure mechanics control position, the transmission tissue layer, the collection dense kettle body, the loose filter sand layer and the fixed jointing bar body. The high-strength high-toughness low temperature-resistant prestressed steel bar has the beneficial effect that the prestress is automatically adjusted and the strength of a composite plate is fully exerted.