Thick-film pressure sensor is a new strain-type pressure sensor that appeared in the 1980s. It is developed by using the piezoresistive effect of thick-film resistors printed and sintered on ceramic elastomers. Four thick film resistors are directly printed and sintered on the ceramic elastic diaphragm, and connected to form a Wheatstone bridge through the conduction band. When the measured liquid level pressure acts on the ceramic elastomer, the elastic diaphragm is flexed and deformed, and at the same time, the thick film resistor printed on the elastic diaphragm also produces the same amount of strain, of which 2 thick film resistors Compressive strain, the resistance decreases; the other two tensile strains, the resistance increases. In this way, the measured pressure value is converted into a bridge output signal, and the magnitude of the signal is proportional to the pressure.