To effectively improve the smoothness of synthesized animation,a digital animation synthesis technology based on virtual re-ality interaction engine is proposed.This method uses cumulative histograms to express the content of shots in animation,and combines the calculation results of shot change rate to extract key frames of shots.Based on this,a distribution map of the maximum values of the three components of animation keyframes is established.The foreground image of the animation target is captured based on the grayscale image,and the target skeleton is extracted.The motion path parameters of the animation target are obtained through the extracted skeleton,and the motion path sequence is extracted;Map and render it through a virtual reality interaction engine to complete digital animation synthesis.The experimental results show that when using this method for animation synthesis,the realism,smoothness,and stability of the synthesized digital animation remain above 90%,indicating that the performance of this method is high and the synthesis effect is good.