The invention relates to a control method for low-pressure pulse duration test of an automobile part, and belongs to the technical field of duration test for automobile parts. Pressure change of an electric cylinder is converted into pressure change of a hydraulic oil cylinder, and applied to a tested part in a hydraulic circulation pipeline, and pulse waves needed for low-pressure pulse duration test of the tested part are provided. The invention also discloses a device for low-pressure pulse duration test of the automobile part. The control method and device are used widely and reliably, and can realizes the pressure waveform of low-pressure pulse duration test via the electric cylinder.