The invention provides a ramp resistance obtaining method for a hybrid electric vehicle to solve the problems that ramp resistance calculation methods are lower in accuracy and deviation occurs easily in the prior art. According to the ramp resistance obtaining method, the driving force and the resistance of the vehicle are comprehensively considered, a vehicle dynamics equation is established accordingly, the acceleration resistance, the sliding resistance and the like outside the vehicle are considered during conversion, meanwhile, the inertia resistance caused by all rotating parts inside the vehicle is further considered, due to comprehensive consideration, the estimated ramp resistance is accurate and reliable with the obtaining method, and an important basis is provided for a shifting strategy, an SOC (state of charge) balance strategy and a torque distribution strategy for ramps.