The invention discloses an automobile transmission plate with an adjustable transmission stroke. The automobile transmission plate with the adjustable transmission stroke comprises a fixed base, wherein a transmission screw road is arranged on the fixed base, and a pair of walking nuts are sleeved on the transmission rod; a transmission plate assembly comprises a transmission base and a transmission adjusting plate, and the two sides of a transmission adjusting plate are provided with guide screw rods inserted into a stroke adjusting grooves; a left support plate and a right support plate arearranged up and down below an installation groove in the transmission base, and clamping grooves are arranged at two ends of the bottom surface of the transmission adjusting plate; according to the invention, the transmission plate assembly is installed by using the double walking nuts, so that the stability is good, and the supporting effect is strong; the stroke range of a seat sliding forwardsand backwards is adjusted and set by using the relative displacement adjustment between the transmission base and the transmission adjusting plate, and the stroke range of the seat is expanded on thebasis of not changing the occupied space of the original seat base; at the same time, a supporting plate structure is combined to ensure the stable support of the transmission adjusting plate, and with great supporting strength and long service lift, the automobile transmission plate is convenient to adapt to the needs of various crowds.