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This paper designed a multi-touch screen system based on multi-purpose vision technology.The system placed three cameras in front of the display and the left and right ends, and enabled ordinary display with touch functionality using computer image processing technology. In order to effectively reduce the image processing time and improve the accuracy of the coordinates of the fingertip, fingertip tracking algorithm was proposed based on the Kalman filter. The fingertip as the center point of ROI (Region of Interest) was predicted by Kalman filter. Experimental results show that the system can effectively run in the real-time embedded platform and achieve the instant detection of finger clicking actions, and it has important significance for the computer vision-based touch-screen technology.