The invention relates to a throwing lever anti-collision device, and belongs to the technical field of gates. The throwing lever anti-collision device comprises a chuck, a clamping block, a spring, a balance shaft, a position sensor and a guiding frame. The hollow chuck with an opening in the side wall is connected with a main shaft of a gate. The clamping block is contained in the chuck and connected to one side of the chuck in a pivoted manner. One end of the spring used for pushing the clamping block to rotate is connected to the clamping block in a pivoted manner, and the other end of the spring is connected with the chuck in a pivoted manner. The balance shaft is fixedly installed on the clamping block, one end of the balance shaft abuts against or is far away from one side of the chuck, and the other end of the balance shaft is connected with a throwing lever after extending out of the other side of the chuck. The position sensor is connected with a control unit of the gate and used for detecting the rotation position of the balance shaft. The guiding frame is installed on a gate crate and provided with an inclined rail used for supporting and guiding the throwing lever to move upwards. Compared with the prior art, the throwing lever anti-collision device has the following beneficial effects that the throwing lever can be prevented from being crashed, and the throwing lever can automatically reset after avoiding vehicles.