The invention discloses a parking block mechanism. The mechanism comprises a floor, a fixed type block rod, and a feedback resistance releasing device. The fixed type block rod is fixed to the floor,the feedback resistance releasing device is mounted on the floor, and comprises a base, a free rotating shaft, a one-way rotating shaft and a caterpillar band, the free rotating shaft and the one-wayrotating shaft are rotatably arranged on the base, the caterpillar band is in end-to-end connection and is arranged on the free rotating shaft and the one-way rotating shaft in a surrounding manner, first gears are arranged on the two ends of the free rotating shaft, and are engaged with the caterpillar band, second gears are arranged on the two ends of the one-way rotating shaft, and are engagedwith the caterpillar band, a shaft body of the one-way rotating shaft is fixedly sleeved with a ratchet wheel, a one-way blocking piece is rotatably arranged on the base, and one end of the one-way blocking piece is arranged on the face of the ratchet wheel in a pressing manner. According to the parking block mechanism, releasing of feedback resistance is achieved, on one hand, the tedious operation step of an experienced driver is reduced, and on the other hand, the damage of wrong operation of a green-hand driver to the vehicle can be reduced.