With the growing development and advancement of the carbon and electricity markets, power producers should accurately capture their own carbon and electricity coupling characteristics. Based on this, bidding for power trading and carbon trading can observably enhance their returns. A model that considers the joint carbon and electricity bidding strategy of power producers in the medium and longterm trading scale is foucused on. A medium-and long-term carbon-electricity joint bidding model for thermal power producers is proposed.In addition, a rolling optimization method is proposed to cope with errors in medium-and long-term time-scale forecasts. The error between actual carbon emissions and carbon allowance margins is periodically revised during the bidding process. The case studies validate the effectiveness of the model and strategy, and the consideration of joint carbon-electricity optimization will substantially reduce the purchase cost of carbon allowances for the bidding power producers, and thus enhance corporate profits.