Mining automobile braking device

A mining automobile braking device comprises a braking rocker arm and a braking bar. The outside of the braking bar is enlarged by six to seven centimeters, a locating shaft sleeve is installed at the enlarged part in coaxial line, and the braking rocker arm and the braking bar are connected in a reversed T shape mode. The outside of braking bar is enlarged on the basis of an existing design, and the detachable coaxial line locating shaft sleeve is installed on the enlarged part, thereby changing a unilateral support to a bilateral support. The braking rocker arm and the braking bar are connected in the reversed T shape mode, stress of an adjusting arm acted on the braking bar is distributed evenly, and a central axis line of the braking bar and central axis lines of three bushes are in parallel motion, thereby removing shearing force, prolonging service life of the braking bar by more than three times, ensuring driving safety and improving intact ratio of automobiles.