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We propose a transmission type dual beam splitter based on all-dielectric encoded metasurface. In order to improve the efficiency of the device, we propose to construct the coding metasurface using double-sided all-dielectric cylindrical cell structure. Based on the electromagnetic dipole resonance characteristics of the all-dielectric resonator, two all-dielectric elements with transmission phase difference π were obtained, and 1-bit coded metasurface was constructed to achieve beam splitting characteristics of incident waves. Based on the finite integral method, we numerically simulate the far-field scattering characteristics of coded metasurface beam splitter. It is found that the number of digital repeats of coding unit particles has a great influence on beam splitting when constructing coding metasurface due to the coupling effect between particles. The energy ratio of double beam splitting can be continuously regulated by changing the incident angle. The dual-beam splitter we designed also has broadband characteristics.

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