At present , there are problems with large errors in the detection of sports injury tissues. In order to im- prove the detection effect of sports injury tissues , an automatic detection method for sports injury tissues based on laser ultrasound technology is proposed. First , analyze the research status of sports injury tissue detection , find out the rea- son why the current sports injury tissue detection effect is poor , then collect the laser ultrasonic image of sports injury tissue , confirm the target position by principal component analysis , remove the noise of ultrasonic image by Bilateral filter method , finally , carry out automatic detection of sports injury tissue , and carry out the simulation experiment of sports injury tissue detection. The results show that , The method proposed in this article has a high signal-to-noise ra- tio for motion damaged tissue images , which can eliminate noise. The average accuracy of motion damaged tissue area detection is 98. 63% , and the average mean square error of motion damaged tissue detection is about 0. 044.