Functional knee protector according to an embodiment of the present disclosure, The patellar opening 110 is formed, and the upper sleeve 120 is located on the thigh when worn around the patellar opening 110, and the lower sleeve 130 is located on the calf when worn around the patellar opening 110. A knee sleeve 100 comprising a; An angle adjusting device 200 built in a pair on both sides of the knee sleeve 100 around the patellar opening 110 and coupled to the upper sleeve 120 and the lower sleeve 130; and a controller 300 for controlling the angle adjusting device 200; including, The angle adjusting device 200 may be configured to adjust the radius of motion of the upper sleeve 120 and the lower sleeve 130 during bending and extension of the knee.
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