The invention discloses a traction type used plastic film retrieving compressing and straw mulching combined machine. The combined machine comprises a universal joint shaft, an electric control system, a hydraulic system, a used plastic film collecting and compressing part, a straw grinding mulching part and a used plastic film curling and retrieving part, wherein the straw grinding mulching part is positioned under the front of the used plastic film collecting and compressing part, and the used film curling and retrieving part is positioned behind the used film collecting and compressing part; the straw grinding mulching part is connected with a film collection tank of the used plastic film collecting and compressing part through a four-bar mechanism; two ends of an adjusting cylinder I are respectively hinged with the straw mulching machine and the film collection tank; the upper part of the used film curling and retrieving part is hinged with a used plastic film collection device; and the middle part of the used film curling and retrieving part is connected with the used plastic film collection device through an adjusting cylinder II. The used plastic film retrieving compressing and straw mulching combined machine has a large-volume film collection tank, can be used for furthest improving the loading capacity of the film collection tank, and is especially suitable for large strip field operation in farms of the Xinjiang Production and Construction Corps.