NOVELTY - A nonwoven fabric-solid polymer electrolyte composite sheet comprises nonwoven fabric having polymer electrolyte containing component (a) and component (b). The component (a) is copolymer chosen from block copolymer containing block chain (a) having repeating unit (I), block chain (b) having repeating unit (II), and multi-branched copolymer (III). The component (b) contains electrolytic salt.    USE - Nonwoven fabric-solid polymer electrolyte composite sheet is used for secondary battery used as power supply for motor vehicles, hybrid cars, electric vehicles, wind power generation and photovoltaic power generation.    ADVANTAGE - The nonwoven fabric-solid polymer electrolyte composite sheet has excellent electric and ionic conductivity, adhesiveness, thermal characteristics and physical characteristics, and is manufactured without rising muck movements between electrodes. The nonwoven fabric-solid polymer electrolyte composite sheet provides secondary battery having short inter electrode distance.    DETAILED DESCRIPTION - A nonwoven fabric-solid polymer electrolyte composite sheet comprises nonwoven fabric having polymer electrolyte containing component (a) and component (b). The component (a) is copolymer chosen from block copolymer containing block chain (a) having repeating unit of formula: -(C(-R1)(-R2)-C(-R3)(-C(=O)-O-(CH(-R4')-CH(-R4")-O)m-R6))- (I), block chain (b) having repeating unit of formula: -(C(-R8)(-R7)-C(-R8)(-R9))- (II) and multi-branched copolymer of formula: X(B'-Y'(A)n1)n2 (III). The component (b) contains electrolytic salt.    R1-R3= H or 1-10C hydrocarbyl;    R4',R4"=H or methyl;    R5=H, 1-10C hydrocarbyl, 1-10C acyl or 3-20C tri-substituted silyl;    m=2-100;    or R1+R3=ring;    R6-R8=H or 1-10C hydrocarbyl;    R9=aryl;    A=copolymer having repeating unit (I);    B'=polymer having repeating unit of formula:-(C(-R10)(-R11)-C(-R8)(R9))-;    R10-R12=H or 1-10 hydrocarbyl;    R13=aryl group or heteroaryl;    Y'=functional group having active halo atom, which connects A and B';    n1=1 or 2;and    n2=2-16.