According to the business characteristics and technical requirements of heavy military vehicles digital collaborative development, the paper proposes the dynamic federal collaborative development method for heavy military vehicles. To realize the method, the key is constructing the three-tier dynamic federal collaborative development environment. So the paper focuses on the research of the business, function and technical architecture of dynamic federal collaborative development environment. Applying the Web Service-Based cross-system collaborative flow controlling method and developing the integrated middleware, the three-tier federal collaborative environment realizes tightly integration. Finally, the application demonstration of a type-product inter-enterprise collaborative development based on the developed digital collaborative development platform verifies the effectiveness and feasibility of the method.