Walking excavator hydraulic system integrated with drilling function and control method

The invention discloses a walking excavator hydraulic system integrated with a drilling function and a control method, the hydraulic system comprises a load-sensitive variable pump, and a P port of the load-sensitive variable pump is connected with P ports of a first load-sensitive multi-way valve and a second load-sensitive multi-way valve; ls ports of the first load-sensitive multi-way valve and the second load-sensitive multi-way valve are connected to an Ls port of the load-sensitive variable pump through a shuttle valve; a port A and a port B of the first load-sensitive multi-way valve are connected with an executing mechanism of the walking excavator, and a port A and a port B of the second load-sensitive multi-way valve are connected with an executing mechanism of the rotary drilling rig. The shuttle valve and the load-sensitive multi-way valve are added to be combined with an existing hydraulic system of the walking type excavator, so that an executing mechanism of the walking type excavator and an ex