The invention relates to an adjustable toy car track support, comprising two adjusting brackets and track fixing parts, wherein the opposite sides of the two adjusting brackets are respectively provided with a groove, and a plurality of sockets are evenly distributed on the upper part and the lower part of the groove; the two ends of the track fixing part are provided with two groups of bulges which are symmetrical and mutually matched with the sockets on the adjusting brackets; and the joints of the adjusting brackets and the track fixing parts are provided with adjusting blocks, and bulges on the adjusting blocks are inserted into the corresponding sockets. The beneficial effects of the invention are as follows: the left-right looseness does not occur to two sections of tracks at the joint of the tracks due to additionally arranging the adjusting blocks, thereby causing the tracks to be coincident and compact.