A transmission for a hybrid vehicle, wherein a first planetary gear mechanism, an input shaft, a first clutch, a second clutch and a brake are arranged in a casing of the transmission; the first planetary gear mechanism comprises a first sun gear, a first planetary gear set, a first ring gear and a first planetary frame, the first sun gear is fixed on the input shaft so that the first sun gear rotates with the input shaft, the first ring gear is drivingly connected with an output gear of the transmission as an output member, the first planetary frame is connected to the casing of the transmission through the brake; the second clutch is arranged between the first ring gear and the input shaft or between the first ring gear and the first planetary frame, and the second clutch is configured such that when the brake is disengaged, the second clutch is engaged to make the rotational speed of the output member equal to the rotational speed of the input shaft; an engine is connected to a rotor of a first electric motor, and the first clutch is arranged between the rotor of the first electric motor and the input shaft; a second electric motor is connected to the input shaft; wherein when the brake is engaged and the second clutch is disengaged, a first gear of the transmission is realized; when the second clutch is engaged and the brake is disengaged, a second gear of the transmission is realized; characterized in that the second electric motor is connected to the input shaft through a second planetary gear mechanism, the second planetary gear mechanism comprises a second sun gear, a second planetary gear set, a second ring gear and a second planetary frame; the second sun gear and the input shaft are independent of each other, the second sun gear is fixed on the rotor of the second electric motor and rotates with the rotor of the second electric motor, the second planetary frame is fixed to the input shaft, the second ring gear is fixed to the casing, and the power of the second electric motor is transmitted to the input shaft through the second planetary frame. the first planetary gear mechanism comprises a first sun gear, a first planetary gear set, a first ring gear and a first planetary frame, the first sun gear is fixed on the input shaft so that the first sun gear rotates with the input shaft, the first ring gear is drivingly connected with an output gear of the transmission as an output member, the first planetary frame is connected to the casing of the transmission through the brake; the second clutch is arranged between the first ring gear and the input shaft or between the first ring gear and the first planetary frame, and the second clutch is configured such that when the brake is disengaged, the second clutch is engaged to make the rotational speed of the output member equal to the rotational speed of the input shaft; an engine is connected to a rotor of a first electric motor, and the first clutch is arranged between the rotor of the first electric motor and the input shaft; a second electric motor is connected to the input shaft; wherein when the brake is engaged and the second clutch is disengaged, a first gear of the transmission is realized; when the second clutch is engaged and the brake is disengaged, a second gear of the transmission is realized; characterized in that the second electric motor is connected to the input shaft through a second planetary gear mechanism, the second planetary gear mechanism comprises a second sun gear, a second planetary gear set, a second ring gear and a second planetary frame; the second sun gear and the input shaft are independent of each other, the second sun gear is fixed on the rotor of the second electric motor and rotates with the rotor of the second electric motor, the second planetary frame is fixed to the input shaft, the second ring gear is fixed to the casing, and the power of the second electric motor is transmitted to the input shaft through the second planetary frame.