Crane supporting leg control method and device, controller and crane

The invention relates to a crane supporting leg control method and device, a controller and a crane. The method comprises the steps of generating a corresponding control instruction in response to a trigger operation performed by an operator on a man-machine interaction device; wherein the man-machine interaction equipment is arranged in a cab of the crane, and the man-machine interaction equipment comprises a display screen; the control instruction is sent to power equipment, so that the power equipment drives the supporting legs to act; the current state parameters of all the supporting legs are obtained and displayed through the man-machine interaction device. According to the scheme, based on the man-machine interaction equipment arranged in the crane cab, an operator can control the crane supporting legs in the crane cab, and the crane supporting legs are not easily influenced by an external severe environment, so that the control experience of the operator is improved; moreover, compared with the contro