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The basic structure and work principal of trail-type V-shape folding hay rake were introduced. The structure of the finger wheel which was the main working part of the machine was designed and the motion trail of the tooth was analyzed. The finger wheel of the machine was studied with simulation analysis by the ADAMS software. The double-hydraulic system was designed to realize automation control. Experiment results indicated that the hay rake had good performance and reasonable structure, the variation coefficient of uniformity of windrow was 15.8%, miss raking rate was 1.2% and leaf loss rate was 2.3%. The hay rake could fold or unfold into a V-shape, so the working raking width could be changed, it could be transported without any difficulties. The whole finger wheels could be risen and fallen automatically and its single finger wheel was adjustable, so it had a good profile modeling ability. The hay rake could perform rake and tedding simultaneously.