This paper presents the studying results of the sodium ion sensor device based on the SnO_2/ITO glass structure in the detection of rinsing solution for contact lenses.The selective membrane contains poly (vinyl chloride) (PVC),bis (2-ethylhexyl) sebacate (DOS),(12-crown-4) methylmalonate (B12C4),and sodium tetrakis (4-fluoropbenyl) borate dehydrate (NaTFBD). The final weight ratios are PVC:DOS:B12C4:NaTFBD=33:66:2:2.In this condition,the sensor has performances with linear sensitivity,short response time,good repeatability and selectivity.The sensor was used to measure the rinsing solution for the contact lenses.Because the experimental results show close to the accurate value for four commercial products,this sensor can preliminary be used in detecting the rinsing solution for the contact lenses.Using this structure and sodium-sensing membrane to construct the sodium sensor is proven successfully in this application. This paper presents the studying results of the sodium ion sensor device based on the SnO2 / ITO glass structure in the detection of rinsing solution for contact lenses. The selective membrane contains poly (vinyl chloride) (PVC), bis (2-ethylhexyl) sebacate The final weight ratios are PVC: DOS: B12C4: NaTFBD = 33: 66: 2: 2 (DOS), (12- crown- 4) methylmalonate (B12C4), and sodium tetrakis (4- fluoropbenyl) borate dehydrate (NaTFBD) .In this condition, the sensor has performances with linear sensitivity, short response time, good repeatability and selectivity. The sensor was used to measure the rinsing solution for the contact lenses.Because the experimental results show close to the accurate value for four commercial products this sensor can initially be used in detecting the rinsing solution for the contact lenses. Using this structure and sodium-sensing membrane to construct the sodium sensor is proven successfully in this application.