The invention discloses a belt wheel press assembly device. The belt wheel press assembly device comprises a power device, a hanging tool, a dynamic press assembly framework, a static supporting frameand a press assembly connecting part. The power device comprises a cylinder and a power rod capable of doing the telescopic movement relative to the cylinder. The static supporting frame and the cylinder are fixedly connected. The hanging tool is connected with the cylinder and the static supporting frame. The press assembly connecting part is fixedly connected with the static supporting frame and can support a to-be-assembled belt wheel. The dynamic press assembly framework is fixedly connected with the power rod and is provided with belt wheel push-pull devices. The dynamic press assembly frame is connected with the static supporting frame and can move relative to the static supporting frame. When the power rod moves, the dynamic press assembly framework can make the belt wheel push-pull devices push and pull the belt wheel.