A telescopic adjuster, comprising: a first linear actuator, comprising a first screw, a pair of first fixing rings (113a, 113b), a first motor and a pair of first guiding rods, wherein the pair of first fixing rings (113a, 113b) are arranged at two respective ends (112a, 112b) of the first screw, the telescopic adjuster being characterized in that the first motor is connected with the first screw, so as to control the first screw to rotate, and the pair of first guiding rods is arranged at two sides of the first screw and penetrates a connecting platform, so as to limit the connecting platform to linear movement; a second linear actuator, comprising a second screw and a second fixing ring, a second motor and a pair of second guiding rods, wherein the second fixing ring is arranged at an end, which is relatively away from a connecting platform, of the second screw, the second motor is connected with the second screw to control the second screw to rotate, and the pair of second guiding rods is located on two sides of the second screw and is fixed to the connecting platform; the connecting platform, wherein the first linear actuator and the second linear actuator are arranged on the connecting platform in parallel, the first screw is capable of pushing the connecting platform to move along the first screw, and the pair of first fixing rings (113a, 113b) limits a movement of the connecting platform; and a first outer cylindrical tube and a second outer cylindrical tube, wherein the first outer cylindrical tube and the second outer cylindrical tube are coaxially arranged, one end of the first outer cylindrical tube is fixed to the connecting platform, and the second screw and the second outer cylindrical tube are movably arranged in the first outer cylindrical tube, and the second screw pushes up the second outer cylindrical tube to protrude from the first outer cylindrical tube. a first linear actuator, comprising a first screw, a pair of first fixing rings (113a, 113b), a first motor and a pair of first guiding rods, wherein the pair of first fixing rings (113a, 113b) are arranged at two respective ends (112a, 112b) of the first screw, the telescopic adjuster being characterized in that the first motor is connected with the first screw, so as to control the first screw to rotate, and the pair of first guiding rods is arranged at two sides of the first screw and penetrates a connecting platform, so as to limit the connecting platform to linear movement; a second linear actuator, comprising a second screw and a second fixing ring, a second motor and a pair of second guiding rods, wherein the second fixing ring is arranged at an end, which is relatively away from a connecting platform, of the second screw, the second motor is connected with the second screw to control the second screw to rotate, and the pair of second guiding rods is located on two sides of the second screw and is fixed to the connecting platform; the connecting platform, wherein the first linear actuator and the second linear actuator are arranged on the connecting platform in parallel, the first screw is capable of pushing the connecting platform to move along the first screw, and the pair of first fixing rings (113a, 113b) limits a movement of the connecting platform; and a first outer cylindrical tube and a second outer cylindrical tube, wherein the first outer cylindrical tube and the second outer cylindrical tube are coaxially arranged, one end of the first outer cylindrical tube is fixed to the connecting platform, and the second screw and the second outer cylindrical tube are movably arranged in the first outer cylindrical tube, and the second screw pushes up the second outer cylindrical tube to protrude from the first outer cylindrical tube.