A caulking gun, including: a main body, having a first end and a second end, the main body having an operation portion, a lower portion of the operation portion near the second end being formed with a handle extending downward; a pushing rod, penetrating the operation portion along a direction from the second end to the first end, an end of the pushing rod near the first end being adapted for pushing a gel in a gel tube; a pushing element, received in the operation portion, tending to move toward the second end under an elastic force of a first elastic element, formed with a first through hole whose internal diameter is larger than an external diameter of the pushing rod, the pushing rod being inserted through the first through hole, the pushing element having an abutting portion at a face thereof facing the second end, the abutting portion being located below the first through hole; a bar-linkage assembly, including a front bar and a rear bar, an end of the rear bar being pivotally connected to a portion of the operation portion near the second end, an end of the front bar being pivotally connected to the rear bar, an end of the front bar away from the rear bar abutting against the abutting portion of the pushing element; a trigger, having a pressing end and a pushing end at two opposite ends thereof, the pressing end being more remote from the operation portion than the pushing end, the pushing end being inserted into the operation portion, the trigger being pivotally connected to the operation portion at a portion between the pressing end and the pushing end but closer to the pushing end than the pressing end, the pushing end being able to drive a connection between the front bar and the rear bar to move upward; wherein when the pressing end of the trigger is pressed toward the handle, the pushing end pushes the connection between the front bar and the rear bar upward so that the front bar pushes the abutting portion of the pushing element toward the first end, thereby the pushing element inclines with respect to the pushing rod so that the pushing rod is grasped by the first through hole, then the pushing element is further moved toward the first end to drive the pushing rod to move toward the first end when the trigger is further pressed characterised in that the front bar has a traversing axle at the end away from the rear bar, the abutting portion of the pushing element is a groove and the traversing axle is received in the groove. a main body, having a first end and a second end, the main body having an operation portion, a lower portion of the operation portion near the second end being formed with a handle extending downward; a pushing rod, penetrating the operation portion along a direction from the second end to the first end, an end of the pushing rod near the first end being adapted for pushing a gel in a gel tube; a pushing element, received in the operation portion, tending to move toward the second end under an elastic force of a first elastic element, formed with a first through hole whose internal diameter is larger than an external diameter of the pushing rod, the pushing rod being inserted through the first through hole, the pushing element having an abutting portion at a face thereof facing the second end, the abutting portion being located below the first through hole; a bar-linkage assembly, including a front bar and a rear bar, an end of the rear bar being pivotally connected to a portion of the operation portion near the second end, an end of the front bar being pivotally connected to the rear bar, an end of the front bar away from the rear bar abutting against the abutting portion of the pushing element; a trigger, having a pressing end and a pushing end at two opposite ends thereof, the pressing end being more remote from the operation portion than the pushing end, the pushing end being inserted into the operation portion, the trigger being pivotally connected to the operation portion at a portion between the pressing end and the pushing end but closer to the pushing end than the pressing end, the pushing end being able to drive a connection between the front bar and the rear bar to move upward; wherein when the pressing end of the trigger is pressed toward the handle, the pushing end pushes the connection between the front bar and the rear bar upward so that the front bar pushes the abutting portion of the pushing element toward the first end, thereby the pushing element inclines with respect to the pushing rod so that the pushing rod is grasped by the first through hole, then the pushing element is further moved toward the first end to drive the pushing rod to move toward the first end when the trigger is further pressed characterised in that the front bar has a traversing axle at the end away from the rear bar, the abutting portion of the pushing element is a groove and the traversing axle is received in the groove.