The invention discloses a spraying membrane heater for a porous ceramic block. The spraying membrane heater comprises a ceramic base material and at least two electricity connection electrodes arranged on the surface of the ceramic base material. Through holes are formed in the ceramic base material. Heating films are sprayed one part or all inner wall surfaces of one part or all of the through holes and one part or all of the surfaces of the ceramic base material. The heating films are connected as one piece, the heating films are connected with the electricity connection electrode. The areaof the heating films is greatly increased, so that the heater can realize the high-power heating function at a small volume. Therefore, the heater is high in heating efficiency. Different electricityconnection electrodes are arranged to be connected with a power supply, and the resistance value of heating films between the electricity connection electrodes can be changed. Therefore, the change ofthe power is realized. The porous shape enables the heat transmission to be more efficient.