The invention belongs to the technical field of endoscopes and discloses an intravascular opto-acoustic absorption, elasticity, viscosity multimode imaging integrated endoscopy and an imaging method. The endoscope device comprises a photoacoubtic signal excitation assembly, a rotation assembly, a signal acquisition assembly, a signal processing and image reconstructing assembly; the photoacoubtic signal excitation assembly comprises a pulse laser, an optical fiber coupler, a multimode optical fiber, an optical fiber slip ring, a focus GRIN lens and a coating reflector; the rotation assembly comprises a stepper motor, an electric slip ring and a torque coil; the signal acquisition assembly comprises an ultrasonic transducer and a data collection card; the signal processing and image reconstructing assembly comprises an amplifier, a preamplifier, an oscilloscope, a lock-in amplifier and a computer; the diameter of the multimode endoscope is 1mm which can realize simultaneous acquisition imaging of three imaging modes or selected imaging of a single mode. The integrated endoscope integrates three imaging modes and advantages thereof; by means of the integrated endoscope, intravascular multi-parameter physical information and multi-scale structural imaging can be obtained.