The invention relates to a direct torque control method for an induction motor based on the non-smooth control technology. The method comprises steps that 1), a constant stator flux linkage control method is employed, an electromagnetic torque equation of the induction motor is established, disturbance components of the system are analyzed according to the electromagnetic torque equation, and disturbance compensation objects are determined; 2), system lumped disturbance observation based on a finite time observer is realized, and estimation of system lumped disturbance is completed; 3), an error system state equation is established according to an error state between the given speed and the feedback speed, a feedback controller in a system forward channel is designed through utilizing finite time control techniques, and a given electromagnetic torque is obtained; and 4), an induction motor direct torque control system based on the non-smooth control technology is established, and reasonable setting of parameters is achieved. The method is advantaged in that 1), the finite time control technology is introduced, the system convergence speed is speeded up, and dynamic system performance is improved; and 2), the designed observer has a simple structure, the algorithm is easy to implement, and good dynamic performance and anti-interference performance are achieved.