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In this paper, a leaky-wave antenna (LWA) array based on substrate integrated waveguide (SIW) is proposed for generating bilateral secant-distributed radiation pattern, which can cover a wide angular range including broadside direction. The LWA array contains two antenna elements and a power recycling network. Each element contains a composite slot constructed by superposing three continuous cosine-shaped slots with different periods in a weighted way, which can achieve a unilateral beam-forming radiation pattern. The power recycling network makes the waves in adjacent antenna elements travel in opposite directions, so the two elements can radiate in reverse directions to generate a bilateral beamforming pattern. The proposed bilateral radiation LWA array is fabricated and measured to verify the efficiency of the design, and the measurement results are in good agreement with those of simulations.