The invention discloses a spinning thread feeding system based on pressure control. A tension adjusting unit comprises a mounting support, thread feeding rollers and lubrication mechanisms; the mounting support is provided with a first roller base, the thread feeding rollers are rotationally installed on the roller base and are each provided with a pressure sensor, the lubrication mechanisms are located on the sides, far away from the roller base, of the thread feeding rollers and are used for coating lubricating oil on the surfaces of the thread feeding rollers, the multiple thread feeding rollers are sequentially arranged in parallel, doubling threads are sequentially wound around the multiple thread feeding rollers, a controller is connected with the multiple pressure sensors and the multiple lubrication mechanisms, and the controller controls the multiple lubrication mechanisms to lubricate the thread feeding rollers according to pressure detection signals of the pressure sensors. By means of the spinning thread feeding system in above optimization design and based on pressure control, the physical design is reasonable; and in the doubling thread conveying process, the pressure of the thread feeding rollers is detected for lubricating the doubling threads, and the thread feeding rollers and the doubling threads are adjusted to rotate in the same direction, friction force between the doubling threads and the thread feeding rollers is reduced, axial tension of the doubling threads is reduced, and thread breakage is prevented.