The invention relates to a production technology of materials, in particular to a production technology of a composite material product. The production technology of the composite material product comprises the following steps that firstly, raw materials are made into rubber materials; secondly, the rubber materials are made into laminated materials; thirdly, the laminated materials are shaped through a mould, and are put into an outer sleeve, the outer sleeve is sleeved with a protection bag, and negative pressure is formed; fourthly, the product is put into a hot-pressing tank to be vulcanized, the pressure in the hot-pressing tank rises to 0.3 Mpa to 3.0 Mpa, the temperature of the hot-pressing tank rises to 60 DEG C to 300 DEG C, and after thermal forming is carried out for 15 minutes to 80 minutes, circulating cooling is carried out, and the product is taken out. According to the technology for producing the composite material product through the hot-pressing tank, the productivity and the efficiency are high, the yield is also high, and the size consistency of the product is good.