A plastic film collector which could recycle plastic film for cotton fields during seedling period was designed, and the parameters of key components were analyzed and confirmed for film-loosening shovel, combined soil-dithering roller etc. The results of film separating from seedlings and soil were achieved very well by using claw type film-loosening shovel combined with flat spindle soil-dithering roller. The problem of breaking or blocking film was resolved by using a floating curl-up film roller which was synchronous with driving roller. Experimental results showed that the best working speed of the collector was 2~3km/h, and the recovery rate was higher than 95.7% and the injury rate to cotton seedlings was less than 2.37% when the height of cotton seedlings was lower than 30cm. The collector could pick up plastic film during seedling period for cotton fields which were used the planting pattern of one film two row seedlings.