This paper firstly analyzes the problems of poor effect and translation recognition effect of cross-border communication of Chinese medicine culture. And countermeasures are proposed according to the current situation, and the LDA text model is introduced. Secondly, the LDA model is improved, the method of changing the rate according to the number of topic transfers is applied, and the topic distribution is updated according to the number. Then the functional and holistic framework of the platform is structured to build a cross-border communication platform for TCM culture. Finally, the recognition rate of the improved TD-LDA model is analyzed experimentally, and the recognition rate is improved from 67% to 84% when the number of test sets is below 1000. For the reliability test analysis of the TCM culture platform communication effect, the standard path coefficient SRW from ZYX to TEA is 0.642, t=12.763, p<0.001. The study indicates that the precision of TCM culture platform communication has a positive effect on the cognitive efficacy of TCM communication.