The invention discloses a method and a device for assessing video quality. The method comprises the steps of: grouping to-be-accessed videos based on video contents, wherein each video group comprises at least two to-be-accessed videos; based on a video grouping result, generating address information pointing at a playing interface comprising the at least two to-be-accessed videos, so as to synchronously play the at least two to-be-accessed videos based on the address information, and obtaining a subjective assessment result of each to-be-accessed video in the at least two to-be-accessed videos; respectively obtaining at least one assessment parameter of the to-be-accessed videos, wherein the at least one assessment parameter represents the quality of the videos; based on the at least one assessment parameter, and a weight coefficient preconfigured for each assessment parameter, obtaining an objective assessment result of the to-be-accessed videos; and based on the subjective assessment result and the objective assessment result of the to-be-accessed videos, obtaining a quality assessment result of the to-be-accessed videos.