The invention discloses a composite plant management system. The system comprises a water box water supply system and a tap water supply system, the water box water supply system is composed of a control main machine (20), a plurality of water pumps (5), water pipes (8), a humidity sensor (10), a water level sensor (6), and a power switch (12) with a 433 receiving function, wherein the control main machine (20) is composed of a timer module (1), a wifi module (2), a 433 module (3), and a temperature illumination acquisition module (4), and the tap water supply system includes a faucet (14), a433 transceiver controller (18), a water pressure sensor (17), and a one-in-two-out solenoid valve (16) with a 433 controller. According to the system provided by the invention, when the tap water pressure is sufficient under normal conditions, tap water is utilized to supply water for plants, and when the water supply is cut off, the water box water supply system is used to supply water.