The study examined the effect of self-video assessment on standardized nursing skills training for new nurses. Participants were 110 new nurses who entered the hospital between January and December 2020, randomly divided into a control group (CG) with traditional assessment and a study group (SG) with video assessment. Both groups received the same training from a professional head nurse. The results of the theoretical and operational assessment, core competencies (CIRN score), self-efficacy (GSES score), practice time and nurses' satisfaction were compared. In SG, the results of theory and operation were significantly better than in CG (p < 0.05). CIRN and GSES scores, practice time, and nurses' satisfaction were significantly higher in SG (p < 0.05). The conclusion states that video assessment promotes standardized skills, core competencies, and nurses' self-efficacy.