The invention discloses a disabled assisting foot control mechanical arm which comprises a big arm support sleeve, a small arm support sleeve and a tong claw, wherein a big arm support and a power supply device are respectively arranged at the upper end of the upper end of the left side and the upper end of the right side of the big arm support sleeve; a circuit board is arranged at the upper end of the power supply device; an elbow driving motor is arranged at the upper end of the big arm support and is used for enabling the big arm support to move in an up and down turning manner; a tong claw opening and closing driving motor is arranged at the upper end of the tong claw; the tong claw opening and closing driving motor is used for controlling the tong claw to be opened and closed so as to grasp and release an article; a connecting plate is arranged at the right end of the tong claw; a tong claw rotation driving motor is arranged at the upper part of the connecting plate and is used for driving the tong claw to move in an inside and outside turning manner so as to be applicable to taking and release of the article at different angles; a wrist driving motor is arranged at the upper end of the left part of the small arm support sleeve and is used for enabling the small arm support sleeve to move in the up and down turning manner relative to the tong claw. The disabled assisting foot control mechanical arm can move in four freedom degrees, is capable of helping a patient to take meal, drink water and the like in daily life, and is applicable people with disabled arms but healthy feet.