1. Tray thermoformed disposable multicavity (2) characterized by forming an assembly with the support (3) tray called seed tray (1) and conceptuada for single use, safeguarding the health and hygiene between different crops for different campañas.2. Multicavity disposable thermoformed tray (2) according to claim 1 characterized by being designed with a series of cavities (4), amount according format flexible material and weight, a single piece of container serving for seed germination. That the assembly between the two parts, these cavities (4) arranged in one piece, engage in the recesses (5), the support (3) tray quickly and easily create an integral assembly which improves its behavior in possible manipulaciones.3. Tray thermoformed disposable multicavity (2) according to claim 1 and 2 characterized by having a series of cavities (4), amount according format in one piece, improving the stability of crops and thus facilitate industrial automation processes in the seedbeds.