The invention provides an intersection assistant vehicle straight-going system, which comprises a main body, a drive mechanism and a plate; the main body comprises a first straight direction area, a first reverse direction area, a second straight direction area and a second reverse direction area; the first straight direction area and the first reverse direction area are arranged in parallel; the second straight direction area and the second reverse direction area are arranged in parallel; the first straight direction area and the second straight direction area are crosswise arranged; the drive mechanism comprises a first straight direction drive mechanism, a first reverse direction drive mechanism, a second straight direction drive mechanism, a second reverse direction drive mechanism, a first transposition mechanism, a second transposition mechanism, a third transposition mechanism and a fourth transposition mechanism; the plate comprises a first straight direction plate, a first reverse direction plate, a second straight direction plate and a second reverse direction plate; the first straight direction drive mechanism is used for driving the first straight direction plate to move from one end to the other end along the first straight direction area. The intersection assistant vehicle straight-going system has the following beneficial effects: the device is used for realizing a plate transportation mode which replaces an existing free traffic mode, so as to improve the traffic efficiency and the traffic condition at an intersection.