The invention discloses a full-automatic thin film suction filter which comprises suction filtering cups, a shell, a pipeline, an electromagnetic valve, a water pump, liquid sensors and an in-place sensor. At least two suction filtering cups are mounted on the shell, the pipeline, the electromagnetic valve, the water pump, the liquid sensors and the in-place sensor are positioned in the shell, each suction filtering cup is connected to the water pump through the pipeline, an electromagnetic valve is arranged on the pipeline, and the in-place sensor is arranged at a position where the suction filtering cup is connected with the shell and connected with the water pump and the electromagnetic valve electrically. A circuit board is arranged in the shell, part of the pipeline is arranged on the circuit board, and the liquid sensors are distributed at positions, on two sides of the pipeline, of the circuit board and electrically connected with the water pump and the electromagnetic valve. Sensing is realized in the whole process through the in-place sensor and the liquid sensors, so that artificial judgment and operation are not needed, manpower and time are saved greatly, and working efficiency is improved greatly.