The invention discloses a biodegradable baseplate used for a soft light electron device and a manufacturing method thereof. The baseplate comprises a flexible substrate and a conducting layer, the conducting layer is located on the flexible substrate, the flexible substrate is made of lac mixed with dual curing glue, the mass ratio of the dual curing glue in the lac is 0.3 - 4%, the dual curing glue is composed of a dual curing system, and the dual curing system is an ultraviolet curing-thermocuring system, an ultraviolet curing-micro curing system, an ultraviolet curing-anaerobic curing system or an ultraviolet curing-electron beam curing system. According to the substrate, after the dual curing treatment, the molecules are crosslinked with one another, the resin molecules in the lac are prevented from crystallization, the light scattering is reduced, the light transmittance of the flexible substrate is improved, the performance of the soft light electron device is improved, and meanwhile the problem that the flexibility of the substrate is not high is solved, the obstructing capacity to water radon of the flexible substrate and the smoothness of the surface of the substrate are promoted, and the affinity between a conductive film and the substrate is improved.