The invention discloses a support for a mobile phone or a tablet computer. The support comprises a support seat, wherein a rear supporting rod rotating in the front-rear direction is connected to therear side of the support seat through a rear rotary shaft; two front supporting rods rotating in the left-right direction are connected to the front side of the support seat through front rotary shafts; a tablet computer fixing plate with a strip-shaped structure or a mobile phone fixing plate with a width is fixed to the front part of the support seat through a detachment screw; at least two suction discs are fixed to the front panel of each of the tablet computer fixing plate and the mobile phone fixing plate; and a lower carrying rod rotating forwards is installed at the inner side of the lower end of each of the two front supporting rods through a lower rotary shaft. The support disclosed by the invention has the beneficial effects of being practical, low in production cost, novel in structure, convenient to adjust in height and angle, and capable of fixing the mobile phone or the tablet computer.