Embodiments of this application disclose a video quality assessment method and device, to improve accuracy of video quality assessment, and a calculated MOSV is more consistent with real video experience of a user. The video quality assessment method provided in the embodiments of this application includes: obtaining a to-be-assessed video, where the to-be-assessed video includes a forward error correction FEC redundancy data packet; when a quantity of lost data packets of a first source block in the to-be-assessed video is less than or equal to a quantity of FEC redundancy data packets of the first source block, generating a first summary packet for a non-lost data packet of the first source block, and generating a second summary packet for a lost data packet of the first source block; and calculating a mean opinion score of video MOSV of the to-be-assessed video based on the first summary packet and the second summary packet.