The invention provides a solvent-assisted horizontal well interwell communication method, which comprises steps: S1, a first organic solvent is injected to a steam injection well and a production well respectively, and shut-in immersion is carried out on the steam injection well ; S2, the first organic solvent in the production well is heated to enable the first organic solvent to be dissolved and diffused towards crude oil, a solvent cavity is formed, and the crude oil enters the solvent cavity and is diffused to the production well; S3, depressurizing stoping is carried out on the production well; S4, the first organic solvent is complementarily injected to the production well again; and S5, steps from S2 to S4 are repeated, and the solvent cavity is expanded continuously until the steam injection well and the production well are communicated. Advantages of gravity drainage of the horizontal wells are fully made use of, the horizontal section uniformly producing degree is improved, demands on the drilling technology are low, water consumption is little, energy consumption is little, and emission is little.