In order to explore the ecological benefits, economic benefits, and their coupling coordination degree of different biochar application modes on sloping farmland in the black soil area, an experimental study was carried out from 2015 to 2018, the 3° slope farmland runoff plot in the northeast black soil area was taken as the research object. Five treatments were set up in the experiment: conventional treatment without biochar (C0) and biochar application rates were 25t/hm2 (C25), 50t/hm2 (C50), 75t/hm2 (C75) and 100t/hm2 (C100). The entropy method and the coupling coordination degree model were used to measure the ecological, economic benefits and their coupling coordination degree of different biochar application modes. The results showed that biochar can effectively improve soil structure, enhance soil fertility, and improve soil water and soil conservation capacity. The ecological benefit of biochar was the best when biochar application rate was 50t/hm2 for two consecutive years. Meanwhile, biochar can effectively improve crop water-saving and yield-increasing performance, and increase the income and utilization efficiency of biochar. The economic benefit of biochar was the best when biochar application rate was 75t/hm2 for one year. The results of the coupling coordination degree calculation showed that the application of biochar can effectively reduce the inhibition degree of ecological and economic benefits. The best biochar application mode was to apply 50t/hm2 biochar for three consecutive years in the black soil area. The ecological and economic benefits of biochar were both high, and their coordination was optimal, which was 0.6849, 0.6345 and 0.5741, respectively. The research results can provide a theoretical basis for the efficient use of black soil resources and the actual production in black soil areas.