Robinson, a 6-foot-10 forward from Washington, led Kansas by scoring 17.7 points and collecting 11.9 rebounds a game in a 32-7 season.
He had 18 points and 17 rebounds in a 67-59 loss to Kentucky in the tournament championship game.
The three seasons Robinson played at Kansas contributed to an overall record of 100-13 and three Big 12 Conference championships for the Jayhawks.
Robinson is considered a strong possibility for one of lottery picks in the NBA draft June. 28.
He is the ninth Kansas player in the last six years to leave school early to enter the NBA draft.