Abstract: The present invention relates to a method for producing foam plastics and a device for effecting same. The method resides in foaming with continuous and proportioned injection of all components successively in two stages, mixing water, resin and a foaming agent under pressure with compressed air to obtain homogenized foam with a foam coefficient of 15 to 20, with subsequent injection thereinto of a curing catalyst together with compressed air. The device for carrying out the proposed method comprises proportioners the inlets whereof are connected to tanks each being intended for a respective component, as well as curing and foaming chambers communicating through two closely adjacent coaxially arranged pipes forming an annulus, the outer pipe being provided with diametrically oposite connections for letting into the annulus the catalyst and compressed air.