Plane injector capable of uniformly distributing propellant

The invention provides a plane injector capable of uniformly distributing a propellant. The plane injector comprises an inlet flange, a top cover, a flow equalizing ring, an outer nozzle, an inner nozzle, a first bottom and a second bottom, a center hole is formed in the center of the top cover, an arc transition section machined on the side face of the center hole is connected with the inlet flange, the outer edge of the top cover is connected with the flow equalizing ring, and the top cover, the inlet flange and the flow equalizing ring form a propellant containing cavity. The two bottoms are located in the propellant containing cavity and comprise a fuel gas spraying pipe and two bottom plate pieces, the two bottom plate pieces are of a disc structure with the fuel gas spraying pipe as the center, the outer edges of the two bottom plate pieces are connected with the inner wall of the flow equalizing ring propellant containing cavity, a plurality of circles of nozzle assembly mounting holes are evenly distr