A laser distance measuring device, a laser distance measuring method, and a movable platform are provided. The laser distance measuring device includes a transmitting module and a receiving module. The transmitting module includes a transmitting circuit and an optical transmitting system, the transmitting circuit is configured to transmit laser pulses, and the optical transmitting system is configured to disperse the laser pulse, to make the laser pulses cover a designated field-of-view area. The receiving module includes a receiving circuit and an optical receiving system, the receiving circuit includes an APD array operating in a linear mode and is configured to receive at least some of returning laser pulses upon the laser pulses being reflected back by a measured object, and convert the at least some of the returning laser pulses into an electrical signal.