A vehicle lamp optical unit, comprising a first optical element, wherein a rear end face and a front end face of the first optical element along a light emergent direction are respectively a light incident structure reference plane and a first light emergent surface, a rear end of the first optical element is formed as a light incident portion, the light incident portion comprises at least one first light incident structure provided along the left and right direction of the light incident structure reference plane, and a first light passage is formed between the light incident portion and the first light emergent surface, wherein the first light incident structure is configured to extend from an upper side or a lower side of the light incident structure reference plane to the first light passage, each of the first light incident structures is capable of guiding light rays received by the first light incident structure to be emitted towards the first light passage and be transmitted to the first light emergent surface along the first light passage, characterized in that the vehicle lamp optical unit further comprises a second optical element; a notch for accommodating the second optical element is formed on a side in the left and right direction of the first optical element; the rear end face and the front end face of the second optical element along the light emergent direction are respectively a light incident surface and a second light emergent surface; the light incident surface is provided with at least one second light incident structure; and the first optical element is provided with a secondary light incident surface, the secondary light incident surface is located in a rear of the first light emergent surface and faces the notch, and the secondary light incident surface comprises at least one curved surface protruding backwards,and the second optical element is configured to be capable of guiding light rays emerging from the second light emergent surface to exit through the first light emergent surface, after incident from the secondary light incident surface. wherein the first light incident structure is configured to extend from an upper side or a lower side of the light incident structure reference plane to the first light passage, each of the first light incident structures is capable of guiding light rays received by the first light incident structure to be emitted towards the first light passage and be transmitted to the first light emergent surface along the first light passage, characterized in that the vehicle lamp optical unit further comprises a second optical element; a notch for accommodating the second optical element is formed on a side in the left and right direction of the first optical element; the rear end face and the front end face of the second optical element along the light emergent direction are respectively a light incident surface and a second light emergent surface; the light incident surface is provided with at least one second light incident structure; and the first optical element is provided with a secondary light incident surface, the secondary light incident surface is located in a rear of the first light emergent surface and faces the notch, and the secondary light incident surface comprises at least one curved surface protruding backwards,and