The invention discloses a bi-color product injection molding method and belongs to the technical field of injection molding technologies. The bi-color product injection molding method is designed forsolving the problem that an existing bi-color plastic product is poor in quality. A single-color forming machine is adopted in the bi-color product injection molding method. The method includes the following steps that A, a material A and a material B are prepared; B, two sets of dies are prepared and includes the first die and the second die; C, the material A is injected into the first die, thetemperature of an injection molding material pipe of the first die is controlled to be T1, the cooling preset time is t2 after the injection molding preset time t1, and a middle product is taken out;and D, the middle product is put into the second die, the temperature of an injection molding plastic pipe of the second die is controlled to be T2, when T2 is smaller than T1, the measurement resultT measurement of a temperature sensor is collected, and when T measurement is larger than T2, the temperature of the injection molding material pipe of the second die is reduced through a controller.By means of the method, the quality of an obtained bi-color injection molding product is good.