Disclosed is a mobile terminal holder (100), comprising a support base (10), a first clamping arm (20), a second clamping arm (30), a support arm (40) and a lock device (60). The first clamping arm (20) and the second clamping arm (30) are oppositely arranged on two sides of the support base (10), and one end of each of the first clamping arm (20) and the support arm (40) is movably arranged in the support base (10); a first transmission gear (14a) is arranged in the support base (10), the first clamping arm (20) is provided with a first transmission rack (23), and the first transmission rack (23) engages with the first transmission gear (14a); the support arm (40) is provided with a positioning block (41), a movable piece (43) and a first elastic reset piece (44), wherein the movable piece (43) is movably arranged on the support arm (40), the movable piece (43) is provided with a movable slot (105) and a third transmission rack (431), the third transmission rack (431) engages with the first transmission gear (14a), the first elastic reset piece (44) is arranged in the movable slot (105), one end of the first elastic reset piece (44) is connected to the support arm (40), and the other end of the first elastic reset piece (44) is connected to the movable piece (43); and the lock device (60) is fixed in the support base (10), and the lock device (60) is located below the positioning block (41). The length of the support arm (40) of the mobile terminal holder (100) is adjustable.
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