The invention discloses a torque signal decomposition and torque distribution method for a hybrid mode of a parallel-type hybrid automobile, and aims at an existing torque signal spectrum decomposition method which decomposes a torque according to a torque change rate threshold, the existing torque signal spectrum decomposition method is simple, but performance index requirements such as pass bandflatness, stop band attenuation, excessive band width, linear phase and the like are difficult to meet. According to the torque signal decomposition and torque distribution method for the hybrid modeof the parallel-type hybrid automobile, a linear phase digital low-pass filter is designed to decompose a torque signal into a low-frequency component and a high-frequency component, wherein the low-frequency component is provided by a slow-response engine and the high-frequency component is provided by a fast-response motor. On the basis, a torque signal distribution strategy is given, an enginetorque is determined based on vehicle speed and gear according to the torque signal distribution strategy, then the motor torque is written down and the engine is ensured to work in an efficient working area, and thus the goal of energy conservation and emission reduction are achieved.