The invention discloses a gear interlocking device for an automobile transmission. The gear interlocking device comprises an installing seat. Shifting fork shafts are installed on the side face of theinstalling seat, a first shaft seat and a second shaft seat are fixedly installed on the bottom face of the installing seat, the shifting fork shafts comprise the first shifting fork shaft, the second shifting fork shaft and the third shifting fork shaft, and first grooves are formed in the outer sides of the left ends of the first shifting fork shaft, the second shifting fork shaft and the thirdshifting fork shaft correspondingly; second grooves are formed in the outer sides of the right ends of the first shifting fork shaft and the third shifting fork shaft correspondingly, the first shaftseat is provided with a left shaft sleeve through a left fixing shaft, and a first clamping rod, a second clamping rod and a third clamping rod are fixedly installed on the outer side of the left shaft sleeve; and the second shaft seat is provided with a right shaft sleeve through a right fixing shaft, and a first limiting rod and a third limiting rod are installed on the outer side of the rightshaft sleeve. According to the gear interlocking device, the structure is simple, less space is occupied, the structure is compact, the service life of the interlocking device is long, and an automobile can travel more stably; and the axial movement of the shifting fork shafts is stable, the interlocking effect of the interlocking device is good, the machining requirement is low, and the cost is low.