The invention discloses a production technique of filter cloth using mixed thermally-melted yarn sprayed cotton as a base layer. The production technique includes feeding materials of layers of filtercloth, namely feeding materials for upper nonwoven, a middle sprayed cotton layer and lower nonwoven, wherein the middle sprayed cotton layer is a sprayed cotton layer with thermally-melted yarn; scattering powder for the middle sprayed cotton layer, to be specific, conveying carbon powder into a powder scattering mechanism, scattering the carbon powder to the middle sprayed cotton layer so thata layer of mixed powder is spread evenly to the middle sprayed cotton layer during transmission; drafting the upper nonwoven, the middle sprayed cotton layer and the lower nonwoven via a drafting mechanism, conveying them into an oven mechanism in stacked manner, and heating in the oven; pressing the heated stacked materials; feeding the pressed materials into a cooling mechanism for cooling. By doping the thermally-melted yarn to the middle sprayed cotton layer, it can be avoided that thermally-melted powder or glue covers carbon powder, leading to influence on the filtering effect of the carbon powder; the filtering effect of the carbon powder can be given to fullest play.