The invention relates to the technical field of medical apparatuses, and discloses a peripheral vascular puncture auxiliary device for obesity patients. The peripheral vascular puncture auxiliary device for obesity patients comprises a fixing sleeve, wherein a guide ring is arranged in the fixing sleeve, a baffle ring is connected to the inner part of the fixing sleeve, and an air sac is connectedto the inner part of the left side of the baffle ring; a swing rod is connected to the outer side of each rotating column, infrared lamps are connected to the lower end of each swing rod, a spring isconnected between each wing rod and a bracket of the baffle ring, and an elastic strip is connected to the upper ends of the swing rods; a first magnetic block is connected to the right end of a sliding block; magnetic balls are rotatably connected to the inner part of a display device; and a second magnetic block is arranged in a transparent board. The elastic strip is driven by the air sac to move downwards, the swing rods move downwards under the pressure of the elastic strip, each swing rod rotates around the corresponding rotating column, and the infrared lamps at the lower ends of the swing rods shift towards the left side, so that through the structure, the problems that through a conventional vascular puncture device, a patient has pain feeling easily, the vascular showing effectsare poor, and the infrared irradiation angle cannot be automatically adjusted can be solved.