The invention provides a suction head of a window cleaner and the window cleaner with the suction head; the suction head of the window cleaner comprises: a shell that defines a cavity, and the cavitycomprises a suction inlet, an outlet and a flow channel communicating with the suction inlet and the outlet; an isolation device that divides the flow channel into a first channel, a second channel and a third channel which are respectively communicated with the suction inlet and the outlet; a switching device that is movably arranged on the shell so that at least one of the first channel, the second channel and the third channel can be communicated. The invention discloses the suction head of the window cleaner. The problems that the suction force at the suction inlet of the window cleaner cannot be adjusted and the suction force is insufficient are solved. The flow channel in the shell can be divided into different channels through the isolation device, the different channels can be communicated through the switching device, so the suction force of the suction inlet is changed, sewage stains are effectively absorbed, operation and use are convenient, the cleaning efficiency is improved, and the suction head of the window cleaner is simple in structure, easy to machine and manufacture and high in practicability.