Automatic telescopic supporting leg device

The utility model discloses an automatic telescopic landing leg device which comprises an installation frame, a power assembly, a guide sleeve, a trapezoid lead screw, a nut and a landing leg, the power assembly and the guide sleeve are both fixedly connected with the installation frame, the trapezoid lead screw is matched with the guide sleeve in a rotating mode, the nut is matched with the trapezoid lead screw in a threaded mode, and the nut is matched with the guide sleeve in a vertical guiding mode through a guide structure. The power assembly is in transmission connection with the trapezoidal screw rod and is used for driving the trapezoidal screw rod to rotate and driving the supporting leg to move up and down in linkage with the nut; by the adoption of the technical scheme, the trapezoidal lead screw can be driven to rotate through the power assembly, the trapezoidal lead screw rotates to drive the nut to move up and down under the cooperation of the guide structure, then the supporting leg is driven t