The invention discloses a grounding state detection apparatus for an electric control cabinet. A main grounding body is in series connection with a relay, a first power source and a detection grounding body to form a grounding state detection loop. A second power source is sequentially in series connection with an alarm device and a normally closed contact of the relay to form an alarm loop. In this way, the grounding state of an electric control cabinet can be uninterruptedly detected in real time, alarming signals are emitted in a bad grounding condition to clearly remind a user, and then safety protection can be provided for the user. A pallet is divided into two U-shaped chambers, and the two chambers are filled with insulating rubber and a dehumidifying agent respectively. The electric control cabinet is prevented from contacting the pallet having insulting and dehumidifying functions. Electric parts in the electric control cabinet are prevented from electric leakage to cause accident. Moreover, the bottom of the electric control cabinet is prevented from being corroded by rainwater and the like. Self-locking universal wheels enable the electric control cabinet to be moved and positioned conveniently. The lower portion of the electric control cabinet is provided with an air guide hood, so rainwater can be guided and is prevented from eroding the cabinet and the pallet.