A clamping holder for fixing a mobile device, comprising: a bottom housing; a clamping mechanism comprising a first clamping tab on one side of the bottom housing and protruding from the bottom housing, and a second clamping tab on the other side of the bottom housing and arranged opposite the first clamping tab; a driving mechanism comprising at least a first sliding connector connected to the first clamping tab and slidably connected to the bottom housing, wherein the first clamping tab can drive the first sliding connector to be able to move toward or away from the second clamping tab, and wherein the clamping mechanism has a clamping state in which the mobile device is clamped and a relaxed state in which the mobile device is released; a reset mechanism having elasticity and two ends thereof being respectively connected to the bottom housing and the first sliding connector, and the reset mechanism having a compressed state in which the reset mechanism is compressed and generates an elastic restoring force when the first clamping tab moves toward the second clamping tab and a released state in which the elastic restoring force is released to cause the first clamping tab to move away from the second clamping tab; and a limiting mechanism connected to the bottom housing, the limiting mechanism having an unlocked state in which the limiting mechanism keeps away from the first sliding connector and a locked state in which the limiting mechanism abuts against the first sliding connector to restrict movement of the first clamping tab away from the second clamping tab; wherein when an external force toward the second clamping tab is applied to the first clamping tab to move the first clamping tab toward the second clamping tab, the reset mechanism is in the compressed state while the clamping mechanism is in the clamping state, such that the clamping mechanism clamps the mobile device; when the limiting mechanism switches from the unlocked state to the locked state, the clamping mechanism remains in the compressed state; and when the external force is eliminated and the limiting mechanism switches from the locked state to the unlocked state, the reset mechanism can switch from the compressed state to the released state, such that the clamping mechanism switches from the clamping state to the relaxed state, characterized in that the limiting mechanism further comprises a rotation shaft connected to the bottom housing, and a locking assembly rotatably connected to the rotation shaft, wherein the locking assembly comprises an adapter rotatably connected to the rotation shaft, a L-shaped locking catch connected to the adapter and used for abutting against the first sliding connector, and a handpiece connected to the adapter and used for handheld control. a bottom housing; a clamping mechanism comprising a first clamping tab on one side of the bottom housing and protruding from the bottom housing, and a second clamping tab on the other side of the bottom housing and arranged opposite the first clamping tab; a driving mechanism comprising at least a first sliding connector connected to the first clamping tab and slidably connected to the bottom housing, wherein the first clamping tab can drive the first sliding connector to be able to move toward or away from the second clamping tab, and wherein the clamping mechanism has a clamping state in which the mobile device is clamped and a relaxed state in which the mobile device is released; a reset mechanism having elasticity and two ends thereof being respectively connected to the bottom housing and the first sliding connector, and the reset mechanism having a compressed state in which the reset mechanism is compressed and generates an elastic restoring force when the first clamping tab moves toward the second clamping tab and a released state in which the elastic restoring force is released to cause the first clamping tab to move away from the second clamping tab; and a limiting mechanism connected to the bottom housing, the limiting mechanism having an unlocked state in which the limiting mechanism keeps away from the first sliding connector and a locked state in which the limiting mechanism abuts against the first sliding connector to restrict movement of the first clamping tab away from the second clamping tab; wherein when an external force toward the second clamping tab is applied to the first clamping tab to move the first clamping tab toward the second clamping tab, the reset mechanism is in the compressed state while the clamping mechanism is in the clamping state, such that the clamping mechanism clamps the mobile device; when the limiting mechanism switches from the unlocked state to the locked state, the clamping mechanism remains in the compressed state; and when the external force is eliminated and the limiting mechanism switches from the locked state to the unlocked state, the reset mechanism can switch from the compressed state to the released state, such that the clamping mechanism switches from the clamping state to the relaxed state, characterized in that the limiting mechanism further comprises a rotation shaft connected to the bottom housing, and a locking assembly rotatably connected to the rotation shaft, wherein the locking assembly comprises an adapter rotatably connected to the rotation shaft, a L-shaped locking catch connected to the adapter and used for abutting against the first sliding connector, and a handpiece connected to the adapter and used for handheld control.