Combined one-way valve for solid rocket orbit attitude control system

The embodiment of the invention provides a combined one-way valve for a solid rocket orbit attitude control system. The combined one-way valve comprises a first valve body, a first valve element assembly, a second valve body, a second valve element assembly and a third valve body. The third valve body comprises three branch parts which are distributed in a T shape; one end of the first branch part is provided with an inlet, and the other end is connected with the second branch part and the third branch part which are coaxial; one end of the first valve element assembly blocks the first port under the first pressure condition, and a first design distance is formed between the first valve element assembly and the first port under the second pressure condition so that the first port can communicate with the first outlet through the first cavity. One end of the second valve element assembly blocks the second port under the first pressure condition, and a second design distance is formed between the second valve e