The invention discloses a hydraulic controllable flow dividing joint for a pipe scraping and sand washing process. The hydraulic controllable flow dividing joint for the pipe scraping and sand washing process comprises an outer-layer pipe column and an inner-layer pipe column, wherein the outer-layer pipe column comprises a pressure transmitting short section which is connected onto the outer side of the upper end of the inner-layer pipe column and is provided with a pressure transmitting hole; the lower end of the pressure transmitting short section is connected with a piston; the piston is circumferentially provided with an inner flow dividing hole and a rail; the lower end of the piston is connected with a spring sleeve; a flow dividing outer cylinder with an outer flow dividing hole is arranged outside the piston in a sleeving way; the flow dividing outer cylinder, the piston and the pressure transmitting short section are closed to form a piston cavity communicated with the pressure transmitting hole; the lower part of the flow dividing cylinder is connected with an outer cylinder, a connecting pipe and a variable button short section which is connected with an outer pipe column; the outer cylinder is provided with a rail nail which slides along the rail; a spring is arranged between the outer cylinder and the spring sleeve. The hydraulic controllable flow dividing joint for the pipe scraping and sand washing process can control opening and closing of a tool by applying hydraulic pressure to the inner-layer pipe column so as to realize communication and closing of an oil jacket annular space and the outer-layer pipe column.