The invention discloses a servo driver brake control circuit which comprises a switch tube, a surge absorption circuit and a CPU (central processing unit) positioned in a servo driver. The CPU outputs a driving signal representing a brake instruction, and the switch tube is on according to the driving signal so as to connect a brake coil power source with a passageway in front of a brake coil. It is observed that the switch tube is adopted as a switch element, and compared with delayed electrification of a relay coil in the process of turning on a relay, the switch tube can be immediately on after receiving the driving signal, so that response speed of a brake circuit can be increased greatly by replacing the relay with the switch tube. In addition, the problem of influence, on brake effect, of bad contact of a relay contact and the problem of short service life of the brake circuit of the servo driver due to frequent action of the relay contact are avoided effectively.