The invention discloses a control method of a drilling arm and digging arm rapid switch mechanism. When a digging arm needs to retract back, a control device controls the oil cylinder stroke of a digging arm amplitude variation pushing rod (11) to become short according to an instruction of a user, the length of the digging arm amplitude variation pushing rod is reduced, a drilling arm outward extending pushing rod (16) is controlled to extend, and outward extension of a drilling arm is achieved. When the digging arm needs to extend outwards, the control device controls to shorten the drilling arm outward extending pushing rod according to the instruction of the user, reaction of the drilling arm is achieved, the oil cylinder stroke of the digging arm amplitude variation pushing rod is controlled to become long, the length of the digging arm amplitude variation pushing rod is increased, and switch control over the drilling arm and the digging arm is carried out at the same time. The switch process of the drilling arm and the digging arm is effectively improved, the double-arm rapid switching in the working process is achieved, the motion interference between the drilling arm and the digging arm is effectively avoided, the product stability, the mechanical reliability and the work productivity are improved, and a product can better adapt to and meet the site working condition with the continuously-changed section.