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In order to explore the effects of biochar and organic fertilizer on net carbon emission from paddy fields in black soil area under water-saving irrigation, a field experiment was carried out in 2023. Two irrigation modes, conventional flooding irrigation (F) and controlled irrigation (C), were set up in the experiment. At the same time, biochar returning (B) and organic fertilizer returning (O) were set up in each irrigation mode, and no material returning (N) was used as the control group, a total of six treatments. The effects of biochar and organic fertilizer on CH4, CO2, N2O emissions and rice yield in paddy soil under two irrigation modes were analyzed. Combined with the change of soil organic carbon content, the net greenhouse gas emissions (NGHGE) of each treatment were calculated. The results showed that under the same material application, the cumulative CH4 emission of controlled irrigation treatment was 71.06%~85.39% lower than that of conventional irrigation. The cumulative emissions of CO2 and N2O were increased by 41.89%~47.97% and 27.56%~38.26%, respectively, compared with that of conventional irrigation. Compared with the control treatment, biochar application reduced the cumulative emissions of N2O and CH4 by 14.31%~23.90% and 15.10%~23.83%, respectively, and increased the cumulative emissions of CO2 by 23.03%~26.63%. The application of organic fertilizer increased the cumulative emissions of N2O, CH4, CO2 by 8.22%~12.09%, 18.36%~19.22%, 51.48%~53.48%, respectively. The application of biochar and organic fertilizer could increase soil organic carbon content and rice yield, and the increase effect was more obvious under controlled irrigation. The NGHGE of controlled irrigation treatment was significantly smaller than that of conventional irrigation (P<0.05), and under controlled irrigation, compared with the control treatment, the NGHGE of biochar and organic fertilizer treatment was decreased by 44.01% and 6.38%, respectively. In summary, the application of biochar under controlled irrigation increased rice yield, increased soil organic carbon storage, and effectively reduced net carbon emissions from paddy fields in black soil areas. The results can provide a scientific basis for the formulation of water and carbon management strategies for water saving, yield increase, carbon sequestration and emission reduction in paddy fields in the black soil region of Northeast China, and it was of great significance for ensuring sustainable agricultural development in Northeast China.